r years the day of heliacal rising； which marked the true beginning of the yearand which still； of course； coincided with the inundationwould have fallen another day behind the calendar。 In the course of 120 years an entire month would be lost； and in 480 years so great would become the shifting that the seasons would be altogether misplaced； the actual time of inundations corresponding with what the calendar registered as the seed…time； and the actual seed…time in turn corresponding with the harvest…time of the calendar。 At first thought this seems very awkward and confusing； but in all probability the effects were by no means so much so in actual practice。 We need go no farther than to our own experience to know that the names of seasons； as of months and days； come to have in the minds of most of us a purely conventional significance。 Few of us stop to give a thought to the meaning of the words January； February； etc。； except as they connote certain climatic conditions。 If； then； our own calendar were so defective that in the course of 120 years the month of February had shifted back to occupy the position of the original January； the change would have been so gradual； covering the period of two life…times or of four or five average generations； that it might well escape general observation。 Each succeeding generation of Egyptians； then； may not improbably have associated the names of the seasons with the contemporary climatic conditions； troubling themselves little with the thought that in an earlier age the climatic conditions for each period of the calendar were quite different。 We cannot well suppose； however； that the astronomer priests were oblivious to the true state of things。 Upon them devolved the duty of predicting the time of the Nile flood； a duty they were enabled to perform without difficulty through observation of the rising of the solstitial sun and its Sothic messenger。 To these observers it must finally have been apparent that the shifting of the seasons was at the rate of one day in four years； this known； it required no great mathematical skill to compute that this shifting would finally effect a complete circuit of the calendar； so that after （4 X 365 =） 1460 years the first day of the calendar year would again coincide with the heliacal rising of Sothis and with the coming of the Nile flood。 In other words； 1461 vague years or Egyptian calendar years Of 365 days each correspond to 1460 actual solar years of 365 1/4 days each。 This period； measured thus by the heliacal rising of Sothis； is spoken of as the Sothic cycle。 To us who are trained from childhood to understand that the year consists of （approximately） 365 1/4 days； and to know that the calendar may be regulated approximately by the introduction of an extra day every fourth year； this recognition of the Sothic cycle seems simple enough。 Yet if the average man of us will reflect how little he knows； of his own knowledge； of the exact length of the year； it will soon become evident that the appreciation of the faults of the calendar and the knowledge of its periodical adjustment constituted a relatively high development of scientific knowledge on the part of the Egyptian astronomer。 It may be added that various efforts to reform the calendar were made by the ancient Egyptians； but that they cannot be credited with a satisfactory solution of the problem； for； of course； the Alexandrian scientists of the Ptolemaic period （whose work we shall have occasion to review presently） were not Egyptians in any proper sense of the word； but Greeks。 Since so much of the time of the astronomer priests was devoted to observation of the heavenly bodies； it is not surprising that they should have mapped out the apparent course of the moon and the visible planets in their nightly tour of the heavens； and that they should have divided the stars of the firmament into more or less arbitrary groups or constellations。 That they did so is evidenced by various sculptured representations of constellations corresponding to signs of the zodiac which still ornament the ceilings of various ancient temples。 Unfortunately the decorative sense； which was always predominant with the Egyptian sculptor； led him to take various liberties with the distribution of figures in these representations of the constellations； so that the inferences drawn from them as to the exact map of the heavens as the Egyptians conceived it cannot be fully relied upon。 It appears； however； that the Egyptian astronomer divided the zodiac into twenty…four decani； or constellations。 The arbitrary groupings of figures； with the aid of which these are delineated； bear a close resemblance to the equally arbitrary outlines which we are still accustomed to use for the same purpose。
IDEAS OF COSMOLOGY In viewing this astronomical system of the Egyptians one cannot avoid the question as to just what interpretation was placed upon it as regards the actual mechanical structure of the universe。 A proximal answer to the question is supplied us with a good deal of clearness。 It appears that the Egyptian conceived the sky as a sort of tangible or material roof placed above the world； and supported at each of its four corners by a column or pillar； which was later on conceived as a great mountain。 The earth itself was conceived to be a rectangular box； longer from north to south than from east to west； the upper surface of this box； upon which man lived； being slightly concave and having； of course； the valley of the Nile as its centre。 The pillars of support were situated at the points of the compass； the northern one being located beyond the Mediterranean Sea； the southern one away beyond the habitable regions towards the source of the Nile； and the eastern and western ones in equally inaccessible regions。 Circling about the southern side of the； world was a great river suspended in mid…air on something comparable to mountain cliffs； on which river the sun…god made his daily course in a boat； fighting day by day his ever…recurring battle against Set； the demon of darkness。 The wide channel of this river enabled the sun…god to alter his course from time to time； as he is observed to do； in winter directing his bark towards the farther bank of the channel； in summer gliding close to the nearer bank。 As to the stars； they were similar lights； suspended from the vault of the heaven； but just how their observed motion of translation across the heavens was explained is not apparent。 It is more than probable that no one explanation was； universally accepted。 In explaining the origin of this mechanism of the heavens； the Egyptian imagination ran riot。 Each separate part of Egypt had its own hierarchy of gods； and more or less its own explanations of cosmogony。 There does not appear to have been any one central story of creation that found universal acceptance； any more than there was one specific deity everywhere recognized as supreme among the gods。 Perhaps the most interesting of the cosmogonic myths was that which conceived that Nuit； the goddess of night； had been torn from the arms of her husband； Sibu the earth…god； and elevated to the sky despite her protests and her husband's struggles； there to remain supported by her four limbs； which became metamorphosed into the pillars； or mountains； already mentioned。 The forcible elevation of Nuit had been effected on the day of creation by a new god； Shu； who came forth from the primeval waters。 A painting on the mummy case of one Betuhamon； now in the Turin Museum； illustrates； in the graphic manner so characteristic of the Egyptians； this act of creation。 As Maspero＇2＇ points out； the struggle of Sibu resulted in contorted attitudes to which the irregularities of the earth's surface are to be ascribed。 In contemplating such a scheme of celestial mechanics as that just outlined； one cannot avoid raising the question as to just the degree of literalness which the Egyptians themselves put upon it。 We know how essentially eye…minded the Egyptian was； to use a modern psychological phrasethat is to say； how essential to him it seemed that all his conceptions should be visualized。 The evidences of this are everywhere： all his gods were made tangible； he believed in the immortality of the soul； yet he could not conceive of such immortality except in association with an immortal body； he must mummify the body of the dead； else； as he firmly believed； the dissolution of the spirit would take place along with the dissolution of the body itself。 His world was peopled everywhere with spirits； but they were spirits associated always with corporeal bodies； his gods found lodgment in sun and moon and stars； in earth and water； in the bodies of reptiles and birds and mammals。 He worshipped all of these things： the sun； the moon； water； earth； the spirit of the Nile； the ibis； the cat； the ram； and apis the bull； but； so far as we can judge； his imagination did not reach to the idea of an absolutely incorporeal deity。 Similarly his conception of the mechanism of the heavens must be a tangibly mechanical one。 He must think of the starry firmament as a substantial entity which could not defy the law of gravitation； and which； therefore； must have the same manner of support as is required by the roof of a house or temple。 We know that this idea of the materiality of the firmament found elaborate expression in those later cosmological guesses which were to dominate the thought of Europe until the time of Newton。 We need not doubt； therefore； that for the Egyptian this solid vault of the heavens had a very real existence。 If now and then some dreamer conceived the great bodies of the firmament as floating in a less material plenumand such iconoclastic dreamers there are in all agesno record of his musings has come down to us； and we must freely admit that if such thoughts existed they were alien to the character of the Egyptian mind as a whole。 While the Egyptians conceived the heavenly bodies as the abiding…place of various of their deities； it does not appear that they practised astrology in the later acceptance of that word。 This is the more remarkable since the conception of lucky and unlucky days was carried by the Egyptians to the extremes of absurdity。 〃One day was lucky or unlucky；〃 says Erman；＇3＇ 〃acc