Ancient egyptian dating system

01-Aug-2020 16:04

It was based on a period of 25 civil years which was approximately equal 309 lunar months.An attempt to reform the calendar to include a leap year was made at the beginning of the Ptolemaic dynasty (Decree of Canopus, 239 BCE), but the priesthood was too conservative to allow such a change.Records suggest that early shadow clocks were based on the shadow from a bar crossing four marks, representing hourly periods starting two hours into the day.At midday, when the sun was at its highest, the shadow clock would be reversed and hours counted down to dusk.This pre-dates the Julian reform of 46 BCE which Julius Caesar introduced on the advice of the Alexandrian astronomer Sosigenese.Reform did, however, come after the defeat of Cleopatra and Anthony by the Roman General (and soon to be Emperor) Augustus in 31 BCE.Marks on either container can be used to give a record of hours passed.

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The first was a lunar calendar based on 12 lunar months, each of which began on the first day in which the old moon crescent was no longer visible in the East at dawn.

Claudius Ptolemaeus also compiled a great catalog of over one thousand stars, in 48 constellations and recorded his concept that the universe revolved around the Earth.