Biot set himself to investigate what was the probable date to which the inscriptions in the Ramesseum referred. When we have the months arranged in a certain relationship to certain constellations we have an opening for the discussion of the precessional movements; in other words, for the consideration of the various changes brought about by the swinging of the pole of the equator round the pole of the ecliptic. Here, again, there was no uncertain sound given out by the research. Biot pointed out that we are here in presence of records, no longer of a summer solstice, as in the case of Denderah, but of a spring equinox, the date being 3285 B.C. He further suggested that, in all probability, one of the mythological figures might be a representation of the intersection of the ecliptic and the equator in the constellation Taurus at the date mentioned. This undoubtedly, to a large extent, justifies what Dupuis had long before pointed out--that the perpetual reference to the Bull found in ancient records and mythologies arose from the fact that this constellation occupied an important position at a critical time in the year, which would indicate a very considerable lapse of time. This idea was justified by the researches of Biot, because we are driven back by them to a date preceding 3000 years B.C. We find in the table at the Ramesseum distinct references to the Bull, the Lion and the Scorpion, and it is also clearly indicated that at that time the star Sirius rose heliacally at the beginning of the Nile-rise. The month-table at Thebes tells us that the sun's journey in relation to some of the zodiacal constellations was perfectly familiar 5000 years ago. CHAPTER XIV. THE CIRCUMPOLAR CONSTELLATIONS: THE MYTH OF HORUS. There was to all early peoples all the difference in the world, of course, between day and night, while we, with our firm knowledge, closely associate them. There was no artificial illumination such as we have, and the dark night did not so much typify rest as death; so that the coming of the glorious morning of tropical or sub-tropical climates seemed to be a re-awakening to all the joys and delights and activities of life; thus the difference between night and day was to the ancient Egyptians almost the difference between death and life. We can imagine that darkness thus considered by a mythologically-thinking people was regarded as the work of an enemy, and hence, in time, their natural enemies were represented as being the friends of darkness. [Illustration: THE GOD OF DARKNESS--SET.] Here a very interesting astronomical point comes in. With these views, there must have been a very considerable difference in the way the Egyptians regarded those stars which were always visible and those which rose and set.