Fierce on her front the blasting Dog-star glowed.
Samuel Taylor Coleridge's On the French Revolution.
One blazes through the brief bright summer's length,
Lavishing life-heat from a flaming car.
Christina G. Rossetti's's Later Life.
of the southern heavens, and thus Canis Australior, lies immediately to the southeast of Orion, cut through its centre by the Tropic of Capricorn, and with its eastern edge on the Milky Way.
It is Cane Maggiore in Italy; Cães in Portugal; Grand Chien in France; and Grosse Hund in Germany.
In early classical days it was simple Canis, representing Laelaps, the hound of Actaeon, or that of Diana's nymph Procris, or the one given to Cephalus by Aurora and famed for the speed that so gratified Jove as to cause its transfer to the sky. But from the earliest times it also has been the Dog of Orion to which Aratos alluded in the Prognostica, and thus wrote of in the Phainomena in connection with the Hare:
The constant Scorcher comes as in pursuit,
. . . and rises with it and its setting spies.
Homer made much of it as Κύων,a but his Dog doubtless was limited to the star Sirius, as among the ancients generally till, at some unknown date, the constellation was formed as we have it, — indeed till long afterwards, for we find many allusions to the Dog in which we are uncertain whether the constellation or its lucida is referred to. Hesiod and Aratos gave this title, both also saying Σείριος, and the latter μέγας; but by this adjective he designed only to characterize the brilliancy of the star, and not to distinguish it from the Lesser Dog. The Greeks did not know the two Dogs thus, nor did the comparison appear till the days of the Roman Vitruvius. p118 Ptolemy and his countrymen knew it by Homer's title, and often as Αστροκύων, although it seems singular that the former never used the word Σείριος.
The Latins adopted their Canis from the Greeks, and it has since always borne this name, sometimes even Canicula in the diminutive (with the adjectival candens, shining), Erigonaeus, and Icarius; the last two being from the fable of the dog Maera, — which itself means Shining, — transported here; her mistress Erigone having been transformed into Virgo, and her master Icarius into Boötes. Ovid alluded to this in his Icarii stella proterva canis [Amor. II.16.4]; and Statius mentioned the Icarium astrum, although Hyginus [Fab. 130] had ascribed this to the Lesser Dog.
Sirion and Syrius occasionally appeared with the best Latin authors; and the Alfonsine Tables of 1521 had Canis Syrius.
Vergil brought it into the 1st Georgic [Georg. I.217] as a calendar sign, —
adverso cedens Canis occidit astro, —
instructing the farmer to sow his beans, lucerne, and millet at its heliacal setting on the 1st of May; the adverso here generally being referred to the well-known reversed position of the figure of Taurus, but may have been intended to indicate the hostility of the Bull to the Giant's Dog that was attacking him.
Custos Europae is in allusion to the story of the Bull who, notwithstanding the Dog's watchfulness, carried off that maiden; and Janitor Lethaeus, the Keeper of Hell, makes him a southern Cerberus, the watch-dog of the lower heavens, which in early mythology were regarded as the abode of demons: a title more appropriate here than for the so-named modern group in the northern, or upper, sky.
Bayer erroneously quoted as proper names Dexter, Magnus, and Secundus, while others had Alter and Sequens; but these originally were designed only to indicate the Dog's position, size, and order of rising with regard to his lesser companion.
The aestifer of Cicero and Vergil referred to its bright Sirius as the cause of the summer's heat, which also induced Horace's invidum agricolis; and Bayer's Ὑδροφοβία was from the absurd notion, prevalent then as now, of the occurrence of canine madness solely during the heat from the Dog-star: an idea first seen with Asclepiades of the 3rd century before Christ. Or it may have come from being confounded by Bayer, none too careful a compiler, with the Ὑδραγωγόν, which Plutarch applied to Sirius in his De Iside,b signifying the Water-bringer, i.e. the cause of the Nile flood.
p119 Aratos termed the constellation ποικίλος, as of varying brightness in its different parts; or mottled — the Dog, lying in as well as out of the Milky Way, being thus diversified in light.
In early Arabia, as indeed everywhere, it took titles from its lucida, although strangely corrupted from the original Al Shīʽrā al ‘Abur al Yamaniyyah, the Brightly Shining Star of Passage of Yemen, in the direction of which province it set. Among these we see, in the Latin Almagest of 1515, "canis: et est asehere, alahabor aliemenia"; in the edition of 1551, Elscheere; in Bayer's Uranometria, Elseiri (which Grotius derived from σείριος), Elsere, Sceara, Scera, Scheereliemini; in Chilmead's Treatise, Alsahare aliemalija; and Elchabar, which La Lande, in his I'Astronomie, not unreasonably derived from Al Kabir, the Great.
The Arabian astronomers called it Al Kalb al Akbar, the Greater Dog, so following the Latins, Chilmead writing it Alcheleb Alachbar; and Al Bīrūnī quoted their Al Kalb al Jabbār, the Dog of the Giant, directly from the Greek conception of the figure. Similarly it was the Persians' Kelbo Gavoro.
It was, of course, important in Euphratean astronomy, and is shown on remains from the temples and mounds, variously pictured, but often just as Aratos described it and as drawn on maps of the present day, — standing on the hind feet, watching or springing after the Hare. Professor Young describes the figure as one "who sits up watching his master Orion, but with an eye out for Lepus."
Bayer and Flamsteed alone among its illustrators showed it as a typical bulldog.
A Dog, presumably this with another adjacent, is represented on an ivory disc found by Schliemann on his supposed site of Troy; and an Etruscan mirror of unknown age bears it with Orion, Lepus, the crescent moon, and correctly located neighboring stars, whileº both of the Dogs, the Dragon, Fishes, Swan, Perseus, the Twins, Orion, and the Hare are described as on the Shield of Hercules in the old poem of that title generally attributed to Hesiod. The Hindus knew it as Mrigavyādha, the Deer-slayer, and as Lubdhaka, the Hunter, who shot the arrow, our Belt of Orion, into the infamous Praja-pati, where it even now is seen sticking in his body; and, much earlier still, with their prehistoric predecessors it was Saramā, one of the Twin Watch-dogs of the Milky Way.
Among northern nations it was Greip, the dog in the myth of Sigurd.
All of these doubtless referred solely to Sirius.
Novidius, who imagined biblical significance in every starry group, said that this was the Dog of Tobias in the Book of Tobit, v.16, which Moxon p120 confirmed "because he hath a tayle," and for that reason only; but Julius Schiller, another of the same school, saw here the royal Saint David.
Gould catalogued 178 stars down to the 7th magnitude.
Hail, mighty Sirius, monarch of the suns!
May we in this poor planet speak with thee?
Mrs. Sigourney's The Stars.
Sirius, the Dog-star, often written Syrius even as late as Flamsteed's and Father Hell's day, has generally been derived from σείριος, sparkling or scorching, which first appeared with Hesiod as a title for this star, although also applied to the sun, and by Abychos to all the stars. Various early Greek authors used it for our Sirius, perhaps generally as an adjective, for we read in Eratosthenes:
Such stars astronomers call σειρίους on account of the tremulous motion of their light;
so that it would seem that the word, in its forms σείρ, σείρος, and σείριος, — Suidas used all three for both sun and star, — originally was employed to indicate any bright and sparkling heavenly object, but in the course of time became a proper name for this brightest of all the stars. Lamb, however, thought it of Phoenician origin, signifying the Chief One, and originally in that country a title for the sun; Jacob Bryant, the mythologist, said that it was from the Egyptians' Cahen Sihor; but Brown considers it a transcription from their well-known Hesiri, the Greek Osiris; while Dupuis distinctly asserted that it was from the Celtic Syr.
Plutarch called it Προόπτης, the Leader, which well agrees with its character and is an almost exact translation of its Euphratean, Persian, Phoenician, and Vedic titles; but Κύων, Κύων σείριος, Κύων ἀστήρ, Σείριος ἀστήρ, Σείριον ἄστρον, or simply το ἄστρον, were its names in early Greek astronomy and poetry. Προκύων, better known for the Lesser Dog and its lucida, also was applied to Sirius by Galen as preceding the other stars in the constellation.
Homer alluded to it in the Iliad as Ὀπωρινός, the Star of Autumn;1 but the season intended was the last days of July, all of August, and part of September — the latter part of summer. Lord Derby translated this celebrated passage:
A fiery light
There flash'd, like autumn's star, that brightest shines
When newly risen from his ocean bath;
p121 while later on in the poem Homer compares Achilles, when viewed by Priam, to
th' autumnal star, whose brilliant ray
Shines eminent amid the depth of night,
Whom men the dog-star of Orion call.
The Roman farmers sacrificed to it a fawn-colored dog at their three festivals when, in May, the sun began to approach Sirius. These, instituted 238 B.C., were the Robigalia, to secure the propitious influence of their goddess Robigo in averting rust and mildew from their fields; and the Floralia and Vinalia, to ensure the maturity of their blooming flowers, fruits and grapes.
Among the Latins it naturally shared the constellation's titles, probably originated them; and occasionally was even Canicula; indeed, as late as 1420 the Palladium of Husbandry urged certain farm-work to be done "Er the caniculere, the hounde ascende"; and, more than a century later, Eden, in the Historie of the Vyage to Moscovie and Cathay, wrote: "Serius is otherwise called Canicula, this is the dogge, of whom the canicular days have theyr name."c
It has been asserted that Ovid and Vergil referred to Sirius in their Latrator Anubis, representing a jackal, or dog-headed Egyptian divinity, guardian of the visible horizon and of the solstices, transferred to Rome as goddess of the chase; but it is very doubtful whether they had in mind either star or constellation.
Its well-known name, Al Shiʽrā, or Al Siʽrā, extended as al Abūr al Yamaniyyah, much resembles the Egyptian, Persian, Phoenician, Greek, and Roman equivalents, and, Ideler thought, may have had common origin with them from some one ancient, source: possibly the Sanskrit Sūrya, the Shining One, — the Sun. The ʽAbur, or Passage, refers to the myth of Canopus' flight to the South; and the adjective to the same, or perhaps to the southerly position of the star towards Yemen, in distinction from that of Al Ghumaisā᾽ in the Lesser Dog, seen towards Shām, — Syria, — in the North. From these geographical names originated the Arabic adjectives Yamaniyyah and Shamāliyyah, Southern and Northern; although the former literally signifies On the Right-hand Side, i.e. to an observer facing eastward towards Mecca.
In Chrysococca's Tables the title is Σιαὴρ Ιαμανὴ; and Doctor C. Edward Sachau's translation of Al Bīrūnī's Chronology renders it Sirius Jemenicus. Riccioli had Halabor, which the 1515 Almagest applied to the constellation; and Chilmead, Gabbar, Ecber, and Habor; while Shaari lobur, another p122 queerly corrupted form, is found in Eber's Egyptian Princess. In the Alfonsine Tables the original is changed to Asceher and Aschere Aliemini; while Bayer gives plain Aschere and Elscheere for the star, with others similar for both star and constellation. Scera is cited by Grotius for the star, and Sceara for the whole, derived from an old lexicon; and Alsere; but he traced all to Σείριος.
In modern Arabia it is Suhail, the general designation for bright stars.
The late Finnish poet Zakris Topelius accounted for the exceptional magnitude of Sirius by the fact that the lovers Zulamith the Bold and Salami the Fair, after a thousand years of separation and toil while building their bridge, the Milky Way, upon meeting at its completion,
Straight rushed into each other's arms
And melted into one;
So they became the brightest star
In heaven's high arch that dwelt —
Great Sirius, the mighty Sun
Beneath Orion's belt.
The native Australians knew it as their Eagle, a constellation by itself; while the Hervey Islanders, calling it Mere, associated it in their folklore with Aldebaran and the Pleiades.
Sharing the Sanskrit titles for the whole, it was the Deer-slayer and the Hunter, while the Vedas also have for it Tishiya or Tishiga, Tistrija, Tishtrya, the Tistar, or Chieftain's, Star. And this we find too in Persia; as also Sira. The later Persian and Pahlavi have Tir, the Arrow. Edkins, however, considers Sirius, or Procyon, to be Vanand, and Arcturus, Tistar.
Hewitt sees in Sirius the Sivānam, or Dog, of the Rig Veda awakening the Ribhus, the gods of mid-air, who "thus calls them to their office of rain sending," a very different office from that assigned to this star in Rome. Yet these gods, philologically, had a Roman connection, for Professor Friedrich Maximilian Mueller, writing the word Arbhu, associates it with the Latin Orpheus. Hewitt also says that in the earliest Hindu mythology Sirius was Sukra, the Rain-god, before Indra was thus known; and that in the Avesta it marked one of the Four Quarters of the Heavens.
Although the identification of Euphratean stellar titles is by no means settled, especially and singularly so as to this great star, yet various authorities have found for it names more or less probable.
Berlin and Brown think it conclusively proved that it was Kak-shisha, the Dog that Leads, and "a Star of the South"; while Kak-shidi is Sayce's transliteration of the original signifying the Creator of Prosperity, a character which the Persians also assigned to it; and it may have been the p123 Akkadian Du-shisha, the Director — in Assyrian Mes-ri-e. Epping and Strassmaier have Kak-ban as a late Chaldaean title, which Brown renders Kal‑bu, the Dog, "exactly the name for Sirius we should expect to find"; Jensen has Kakkab lik-ku, the Star of the Dog, revived in Homer's κύων; and it perhaps was the Assyrian Kal-bu Sa-mas, the Dog of the Sun; and the Akkadian Mul-lik-ud, the Star Dog of the Sun. Jensen also gives Kakkab kasti, the Bow Star, although this may be doubtful; and Brown has, from the Assyrian, Su-ku-du, the Restless, Impetuous, Blazing, well characterizing the marked scintillation and color changes in its light. Hewitt cites an Akkadian title Tis-khu.
Its risings and settings were regularly tabulated in Chaldaea about 300 B.C., and Oppert is reported to have recently said that the Babylonian astronomers could not have known certain astronomical periods, which as a matter of fact they did know, if they had not observed Sirius from the island of Zylos in the Persian Gulf on Thursday, the 29th of April, 11542 B.C.!º
It is the only star known to us with absolute certitude in the Egyptian records — its hieroglyph, a dog, often appearing on the monuments and temple walls throughout the Nile country. Its worship, chiefly in the north, perhaps, did not commence till about 3285 B.C., when its heliacal rising at the summer solstice marked Egypt's New Year and the beginning of the inundation, although precession has now carried this rising to the 10th of August. At that early date, according to Lockyer, Sirius had replaced γ Draconis as an orientation point, especially at Thebes, and notably in the great temple of Queen Hatshepsu, known to-day as Al Dēr al Bahārī, the Arabs' translation of the modern Copts' Convent of the North. Here it was symbolized, under the title of Isis Hathor, by the form of a cow with disc and horns appearing from behind the western hills. With the same title, and styled Her Majesty of Denderah, it is seen in the small temple of Isis, erected 700 B.C., which was oriented toward it; as well as on the walls of the great Memnonium, the Ramesseum, of Al Ḳurneh at Thebes, probably erected about the same time that this star's worship began. Lockyer thinks that he has found seven temples oriented to the rising of Sirius. It is also represented on the walls of the recently discovered step-temple of Saḳḳara, dating from about 2700 B.C., and supposed to have been erected in its honor.
Great prominence is given to it on the square zodiac of Denderah, where it is figured as a cow recumbent in a boat with head surmounted by a star; and again, immediately following, as the goddess Sothis, accompanied by the goddess Anget, with two urns from which water is flowing, emblematic p124 of the inundation at the rising of the star. But in the earlier temple service of Denderah it was Isis Sothis, at Philae Isis Sati, or Satit, and, for a long time in Egypt's mythology, the resting-place of the soul of that goddess, and thus a favorable star. Plutarch made distinct reference to this [de Iside 359D]; although it should be noted that the word Isis at times also indicated anything luminous to the eastward heralding sunrise. Later it was Osiris, brother and husband of Isis, but this word also was applied to any celestial body becoming invisible by its setting. Thus its titles noticeably changed in the long period of Egypt's history.
As Thoth, and the most prominent stellar object in the worship of that country, — its heliacal rising was in the month of Thoth, — it was in some way associated with the similarly prominent sacred ibis, also a symbol of Isis and Thoth, for, in various forms, the bird and star appear together on Nile monuments, temple walls, and zodiacs.
Sirius was worshiped, too, as Sihor, the Nile Star, and, even more commonly, as Sothi and Sothis, its popular Graeco-Egyptian name, the Brightly Radiating One, the Fair Star of the Waters; but in the vernacular was Sept, Sepet, Sopet, and Sopdit; Sed,2 and Sot, — the Σήθ of Vettius Valens.
Upon this star was laid the foundation of the Canicular, Sothic, or Sothiac Period named after it, which has excited the attention and puzzled the minds of historians, antiquarians, and chronologists. Lockyer has an admirable discussion of this in his Dawn of Astronomy.
Sir Edwin Arnold writes of it in his Egyptian Princess:
And even when the Star of Kneph has brought the summer round,
And the Nile rises fast and full along the thirsty ground;
for the Egyptians always attributed to the Dog-star the beneficial influence of the inundation that began at the summer solstice; indeed, some have said that the Aethiopian Nile took from Sirius its name Siris, although others consider the reverse to be the case. Minsheu, who dwells much on this, ends thus: "Some thinke that the Dog-starre is called Sirius, because at the time the Dogge-starre reigneth, Nilus also overfloweth as though the water were led by that Starre." Indeed, it has been fancifully asserted that its canine title originated in Egypt, "because of its supposed watchful care over the interests of the husbandman; its rising giving him notice of the approaching overflow of the Nile."
Caesius cited for it Solechin as from that country, signifying the Starry Dog, and derived from the Egypto-Greek word Σολεκήν.
p125 Perhaps it is the ancient importance of this Dog on the Nile that has given the popular name, the Egyptian X, to the figure formed by the stars Procyon and Betelgeuze, Naos and Phaet, with Sirius at the vertices of the two triangles and the centre of the letter. On our maps Sirius marks the nose of the Dog.
The Phoenicians are said to have known it as Hannabeah, the Barker.
The astronomers of China do not seem to have made as much of Sirius as did those of other countries, but it is occasionally mentioned, with other stars in Canis Major, as Lang Hoo; and Reeves quoted for it Tseen Lang, the Heavenly Wolf. Their astrologers said that when unusually bright it portended attacks from thieves.
Some have called it the Mazzārōth of the Book of Job; others the Ḣaṣīl of the Hebrews; but this people also knew it as Sihor, its Egyptian name, and Ideler thinks that the adoration of the Sɛērīm, or "Devils" of the Authorized Version of our Bible, the "He Goats" of the Revision, which, as we see in Leviticus xvii.7, was specially prohibited to the Jews, may have had reference to Sirius and Procyon, the Two Sirii or Shiʽrayān, that must have been well known to them in the land of their long bondage as worshiped by their taskmasters.
The culmination of this star at midnight was celebrated in the great temple of Ceres at Eleusis, probably at the initiation of the Eleusinian mysteries; and the Ceans of the Cyclades predicted from its appearance at its heliacal rising whether the ensuing year would be healthy or the reverse. In Arabia, too, it was an object of veneration, especially by the tribe of Kais, and probably by that of Kodhā'a, although Muḥammad expressly forbade this star-worship on the part of his followers. Yet he himself gave much honor to some "star" in the heavens that may have been this.
In early astrology and poetry there is no end to the evil influences that were attributed to Sirius.
Homer wrote, in Lord Derby's translation,
The brightest he, but sign to mortal man
Of evil augury.
Pope's very liberal version of the same lines, —
Terrific glory! for his burning breath
Taints the red air with fevers, plagues and death, —
seems to have been taken from the Shepheard's Kalendar for July:
The rampant Lyon hunts he fast with dogge of noysome breath
Whose baleful barking brings in hast pyne, plagues and dreerye death.
Spenser, however, was equally a borrower, for we find in the Aeneid:
p126 The dogstar, that burning constellation, when he brings drought and diseases on sickly mortals, rises and saddens the sky with inauspicious light;
and in the 4th Georgic:
Jam rapidus torrens sitientes Sirius Indos
rendered by Owen Meredith in his Paraphrase on Vergil's Bees of Aristaeus:
Swift Sirius, scorching thirsty Ind,
Was hot in heaven.
Hesiod advised his country neighbors, "When Sirius parches head and knees, and the body is dried up by reason of heat, then sit in the shade and drink," — advice universally followed, even till now, although with but little thought of Sirius. Hippocrates made much, in his Epidemics and Aphorisms, of this star's power over the weather, and the consequent physical effect upon mankind, some of his theories being current in Italy even during the last century; while the result of all physic depended upon the sign of the zodiac in which the sun chanced to be. Manilius wrote of Sirius:
from his nature flow
The most afflicting powers that rule below.
But these expressions as to the hateful character of the Dog-star may have been induced in part from the evil reputation of the dog in the East.
Its heliacal rising, 400 years before our era, corresponded with the sun's entrance into the constellation Leo, that marked the hottest time of the year, and this observation, originally from Egypt, taken on trust by the Romans, who were not proficient observers, and without consideration as to its correctness for their age and country, gave rise to their dies caniculariae, the dog days, and the association of the celestial Dog and Lion with the heat of midsummer. The time and duration of these days, although not generally agreed upon in ancient times, any more than in modern, were commonly considered as beginning on the 3d of July and ending on the 11th of August, for such were the time and period of the unhealthy season of Italy, and all attributed to Sirius. The Greeks, however, generally assigned fifty days to the influence of the Dog-star. Yet even then some took a more correct view of the matter, for Geminos wrote:
It is generally believed that Sirius produces the heat of the dog days; but this is an error, for the star merely marks a season of the year when the sun's heat is the greatest.
But he was an astronomer.
p127 The idea prevailed, however, even with the sensible Dante in his "great scourge of days canicular"; while Milton, in Lycidas, designated it as "the swart star." And the notion holds good with many even to the present time. This character doubtless is indicated on the Farnese globe, where the Dog's head is surrounded with sun-rays.
But Pliny took a kinder view of this star, as in the "xii. chapyture of the xi. booke of his naturall hystorie," [XI.XII.30] on the origin of honey:
This coometh from the ayer at the rysynge of certeyne starres, and especially at the rysynge of Sirius, and not before the rysynge of Vergiliae (which are the seven starres cauled Pleiades) in the sprynge of the day;
although he seems to be in doubt whether "this bee the swette of heaven, or as it were a certeyne spettyl of the starres." This idea is first seen in Aristotle's History of Animals. So, too, in late astrology wealth and renown were the happy lot of all born under this and its companion Dog. Our modern Willis wrote in his Scholar of Thebet ben Khorat:
Mild Sirius tinct with dewy violet,
Set like a flower upon the breast of Eve.
When in opposition Sirius was supposed to produce the cold of winter.
It has been in all history the brightest star in the heavens, thought worthy by Pliny of a place by itself among the constellations, and even seen in broad sunshine with the naked eye by Bond at Cambridge, Massachusetts, and by others at midday with very slight optical aid; but its color is believed by many to have changed from red to its present white. This question recently has been discussed, by See in the affirmative and Schiaparelli in the negative, at a length not allowing repetition here, the weight of argument, however, seeming to be against the admission of any change of color in historic times.
Aratos' term ποικίλος, applied to the Dog, is equally appropriate to Sirius now in the sense of many-colored or changeful, and is an admirable characterization, as one realizes when watching this magnificent object coming up from the horizon on a winter evening. Tennyson, who is always correct as well as poetical in his astronomical allusions, says in The Princess:
the fiery Sirius alters hue
And bickers into red and emerald;
this, of course, being largely due to its marked scintillation; and Arago gave Barāḳish as an Arabic designation for Sirius, meaning Of a Thousand p128 Colors; and said that as many as thirty changes of hue in a second had been observed in it.3
Sirius, notwithstanding its brilliancy, is by no means the nearest star to our system, although it is among the nearest; only two or three others having, so far as is yet known, a smaller distance. Investigations up to the present time show a parallax of 0″.39, indicating a distance of 8.3 light years, nearly twice that of α Centauri.
Some are of the opinion that the apparent magnitude of Sirius is partly due to the whiteness of its tint and its greater intrinsic brilliancy; and that the red stars, Aldebaran, Betelgeuze, and others, would appear much brighter than now if of the same color as Sirius; rays of red light affecting the retina of the eye more slowly than those of other colors. The modern scale of magnitudes that makes this star ‑1.43, — about 9½ times as bright as the standard 1st-magnitude star Altair (α Aquilae), — would make the sun ‑25.4, or 7000 million times as bright as Sirius; but, taking distance into account, we find that Sirius is really forty times brighter than the sun.
Its spectrum, as type of the Sirian in distinction from the Solar, gives name to one of the four general divisions of stellar spectra instituted by Secchi from his observations in 1863‑67; these two divisions including nearly 11⁄12 of the observed stars. Of these about one half are Sirian of a
brilliantly white colour, sometimes inclining towards a steely blue. The sign manual of hydrogen is stamped upon them with extraordinary intensity
by broad, dark shaded lines which form a regular series.
It is found by Vogel to be approaching our system at the rate of nearly ten miles a second, and, since Rome was built, has changed its position by somewhat more than the angular diameter of the moon.
It culminates on the 11th of February.
The celebrated Kant thought that Sirius was the central sun of the Milky Way; and, eighteen centuries before him, the poet Manilius said that it was "a distant sun to illuminate remote bodies," showing that even at that early day some had knowledge of the true character and office of the stars.
Certain peculiarities in the motion of Sirius led Bessel in 1844, after ten years of observation, to the belief that it had an obscure companion with which it was in revolution; and computations by Peters and Auwers led Safford to locating the position of the satellite, where it was found as p129 predicted on the 31st of January, 1862, by the late Alvan Clark,4 at Cambridgeport, Mass., while testing the 18½-inch glass now at the Dearborn Observatory. It proved to be a yellowish star, estimated as of the 8½ magnitude, but difficult to be seen because of the brilliancy of Sirius, and then 10″ away; this diminishing to 5″ in 1889; and last seen and measured by Burnham at the Lick Observatory before its final disappearance in April, 1890. Its reappearance was observed from the same place in the autumn of 1896 at a distance of 3″.7, with a position angle of 195°. It has a period of 51½ years, and an orbit whose diameter is between those of Uranus and Neptune; its mass being one third that of Sirius and equal to that of our sun, although its light is but 1⁄10000 its principal, soº that it may be supposed to be approaching non-luminous solidity, — one of Bessel's "dark stars."
It is remarkable that Voltaire in his Micromegas of 1752, an imitation of Gulliver's Travels, followed Dean Swift's so‑called prophetic discovery of the two moons of Mars by a similar discovery of an immense satellite of Sirius, the home of his hero. Swift, however, owed his inspiration to Kepler, who more than a century previously wrote to Galileo:
I am so far from disbelieving in the existence of the four circumjovial planets, that I long for a telescope to anticipate you, if possible, in discovering two round Mars (as the proportion seems to me to require), six or eight round Saturn, and perhaps one each round Mercury and Venus.
Other stars are shown by the largest glasses in the immediate vicinity of Sirius, two additional having very recently been discovered by Barnard at the Yerkes Observatory.
Murzim, generally but less correctly Mirzam, and occasionally Mirza, is from Al Murzim,5 the Announcer, often combined by the Arabs with β Canis Minoris in the plural Al Mirzamāni, or as Al Mirzamā al Shiʽrayain, the two Sirian Announcers; Ideler's idea of the applicability of this title being that this star announced the immediate rising of the still brighter Sirius.
Buttmann asserted that it also was Al Kalb, the Dog, running in front p130 of Sirius, but this must have been from early times in the Desert. In our maps it marks the right fore foot of the Dog.
The Chinese called it Kuen She, the Soldiers' Market.
γ, 4.5, is Burritt's Muliphen that properly belongs to δ and to stars in Columba; but the Century Atlas has it Mirza.
It is Isis with Bayer, which Ideler confirms, but Grotius applied the title to the adjacent μ, adding, however, nisi potius quarta sit, thus referring to γ.d
Montanari said that it entirely disappeared in 1670, and was not again observed for twenty-three years, when it reappeared to Miraldi, and since has maintained a steady lustre, although faint for its lettering.
It marks the top of the Dog's head.
is the modern Wezen, from Al Wezn, Weight, "as the star seems to rise with difficulty from the horizon"; but Ideler justly calls this an astonishing star-name.
It also was one of the Muḥlifaïn particularly described under Columba.
The Chinese knew η and κ of Canis Major, with stars in Argo, as Hoo She, the Bow and Arrow.
Gould thought δ variable. It lies near the Dog's hind quarter, and has a 7.5‑magnitude companion 2′45″ away, readily seen with an opera-glass.
Adara, Adhara, Adard, Udara, and Udra are from Al ʽAdhārā, the Virgins, applied to this star in connection with δ, η, and ο; perhaps from the Arabic story of Suhail. It has also been designated Al Zara, with probably the same signification, although this form is erroneous.
The component stars are 7″.5 apart, at a position angle of 160°.6.
Furud is either from Al Furud, the Bright Single Ones, or, perhaps by a transcriber's error, from Al Ḳurūd, the Apes, referring to the surrounding small stars with some of those of Columba; Ideler thought the latter derivation more probable. Al Sufi mentioned these as Al Agribah, the Ravens.
ζ marks the toe of the right hind foot.
Aludra is from Al ʽAdhrā, the singular of Al ʽAdhārā, and one of that group. This title has been universal from the days of Arabian catalogues and globes to our modern lists.
Smyth wrote in his notes on η, "Well may Hipparchus be dubbed the Praeses of ancient astronomers!" for that great man used this star, then at 90° of right ascension, as convenient in astronomical reckoning.
μ, a double, of 4.7 and 8th magnitudes, 2″.9 apart, yellow and blue, was known as Isis by Grotius, although he admitted that γ might have been the one referred to by this title.
ο1, a red star of the 4th magnitude, and π, a double, of 5th and 10th magnitudes, with other small stars in the body of the Dog, were the Chinese Ya Ke, the Wild Cock.
Bayer's star-lettering for this constellation ended with ο, but Bode added others down to ω.
1 The Greeks had no word exactly equivalent to our "autumn" until the 5th century before Christ, when it appeared in writings ascribed to Hippocrates.
2 According to Mueller, this Sed, or Shed, of the hieroglyphic inscriptions appeared in Hebrew as El Shaddar.
3 Montigny's scintillometer has marked as many as seventy-eight changes in a second in various white stars standing 30° above the horizon, though a somewhat less number in those of other colors.
4 His death occurred on the 9th of June, 1897, in the sixty-fifth year of his age, just after the completion and successful installation of the 40‑inch glass in the Yerkes Observatory, the greatest of his many great lenses, and the last, excepting the 24‑inch for Mr. Percival Lowell.
5 Literally the Roarer, and so another of the many words in the Arabic tongue for the lion, of which that people boasted of having four hundred.
a More accurately, and with the citations, see Prof. Mair's note to Oppian, Hal. III.48.
b What Allen actually has is "De Isidoro"; but there is no such work by Plutarch. The reference is to the opening sentence of chapter 38 (366A) of De Iside et Osiride, Τῶν τ’ ἄστρων τὸν σείριον Ἴσιδος νομίζουσιν, ὑδραγωγὸν ὄντα. The lesson a student can learn from this, of course, is to make quite sure you know what you're abbreviating, and/or take care in deciphering your own notes! "Isid." usually stands for Isidore, a different writer altogether; and "de Isid." for the work by Plutarch.
c Perhaps the sweltering heat of midsummer is what has Diodorus Siculus stating that Sirius "is thought to bring destruction upon mankind" (IV.82.3); Ptolemy, on the other hand, considers the star — in the mouth of the Dog — good in its astrological influences, like a mix of Jupiter and Mars in which the latter preponderates (Tetrabiblos, I.9).
d Diodorus Siculus has Isis herself state in a hieroglyphic inscription that she is the one "who riseth in the star that is in the Constellation of the Dog" (I.27.4). This might be any star of the constellation, but see the translator's note on that passage: at least one ancient authority identifies Isis with Sirius.
Images with borders lead to more information.
The thicker the border, the more information. (Details here.)
A page or image on this site is in the public domain ONLY if its URL has a total of one *asterisk. If the URL has two **asterisks, the item is copyright someone else, and used by permission or fair use. If the URL has none the item is © Bill Thayer.
See my copyright page for details and contact information.
Page updated: 23 Apr 11