For it is obvious that if each 7th day during the year was observed as above, it would, like our Sunday or a Jewish Sabbath, fall on a different day of the month in different months.
On the 10th day of the month every household shall take a firstling male without blemish, of sheep or goat, and should kill it on the 14th at even, and sprinkle the two sideposts and lintel with the blood, and eat the roasted flesh, not sodden, including head, legs and inwards; all remaining over until the morning to be burnt by fire.
The first month on the 14th day of the month is the Passover; the 15th day of this month shall be a feast; seven days unleavened bread to be eaten; first day a holy assembly with fire offering, two young bullocks and one lamb and seven firstling he-lambs without blemish, with appropriate meal offering and one he-goat for sin-offering; on the seventh day another hol assembly.
As to the astronomical knowledge of Thales we have the following notices: - (1) besides the prediction of the solar eclipse, Eudemus attributes to him the discovery that the circuit of the sun between the solstices is not always uniform; 6 (2) he called the last day of the month the thirtieth (Diog.
It is the only one which Mahommedanism enjoins; but the doctors of the law recommend a considerable number of voluntary fasts, as for example on the tenth day of the month Moharram.
The era begins from the first day of the month of Muharram preceding the flight, or first day of that Arabian year which coincides with Friday, July 16, 622 A.D.
In January, therefore, the 14th day of the month was called the nineteenth before the Calends of February (counting inclusively), the 15th was the 18th before the Calends and so onto the 3 0 th, which was called the third before the Calend (tertio Calendas), the last being the second of the Calends, or the day before the Calends (pridie Calendas).
The Passover was kept in the first month on the 14th day of the month at even in the wilderness of Sinai; but certain men, unclean by touching a dead body, asked what they should do; they were to keep it on the second month on the 14th day, eating it with unleavened bread and bitter herbs, leaving none of it until the morning, nor breaking a bone.
Further, if the Sabbaths fell on each 7th day through the year, any indication by dated documents of a falling off in the number of transactions on the 7th day of the month must obviously be completely disguised.