Those who wish to study the evidence in detail should read Procter's work on the _Problems of the Pyramids_, but for the present purpose it may be sufficient to sum up the conclusions of that accomplished astronomer. He says, "The sun's annual course round the celestial sphere could be determined much more exactly than by any gnomon by observations made from the great gallery. The moon's monthly path and its changes could have been dealt with in the same effective way. The geometric paths, and thence the true paths of the planets, could be determined very accurately. The place of any visible star along the zodiac could be most accurately determined." If therefore the pyramid had only been completed up to the fiftieth layer, which would leave the southern opening of the great gallery uncovered, the object might have been safely assumed to be the erection of a great national observatory. But this supposition is negatived by the fact that the grand gallery must have been shut up, and the building rendered useless for astronomical purposes in a very short time, by the completion of the pyramid, which was then covered over by a casing of polished stone, evidently with a view of concealing all traces of the passages which led to the tomb. The only possible solution seems to be that suggested by Procter, that the object was astrological rather than astronomical, and that all those minute precautions were taken in order to provide not only a secure tomb but an accurate horoscope for the reigning monarch. Astrology and astronomy were in fact closely identified in the ancient world, and relics of the superstition still linger in the form of Zadkiel almanacs. When the sun, moon, and five planets had been identified as the celestial bodies possessing motion, and therefore, as it was inferred, life, and had been converted into gods, nothing was more natural than to suppose that they exercised an influence on human affairs, and that their configuration affected the destinies both of individuals and of nations. A superstitious people who saw auguries in the flight of birds, the movements of animals, the rustling of leaves, and in almost every natural occurrence, could not fail to be impressed by the higher influences and omens of those majestic orbs, which revolved in such mysterious courses through the stationary stars of the host of heaven. Accordingly in the very earliest traditions of the Accadians and Egyptians we find an astrological significance attached to the first astronomical facts which were observed and recorded. The week of seven days, which was doubtless founded on the first attempts to measure time by the four phases of the lunar month, became associated with the seven planets in the remotest antiquity, and the names of their seven presiding gods, in the same order and with the same meaning, have descended unchanged to our own times, as will be shown more fully in a subsequent chapter.