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On the advice of Sosigenes, a learned astronomer from Alexandria, Caesar adds ninety days to the year 46 BC and starts a new calendar on 1 January 45.
Sosigenes advises Caesar that the length of the solar year is 365 days and six hours.
Plants and animals grow and die, rain falls, rivers flow. In the daytime it is moody; there may be blazing sun, or racing clouds, or darkness followed by thunder and lightning.
And yet on a clear night the sky is the very opposite - predictable, if you look hard enough, with recognizable groups of stars moving in a slow but reliable manner.
But the length of a year is exceptionally hard to measure.
Primitive societies make do with a broad concept, counting the year as starting when leaves sprout on a particular tree or describing someone as having lived through a certain number of harvests.
The sky is the most mysterious part of our everyday experience.
Familiarity may make the amazing events going on at ground level seem almost ordinary. Two great objects travel through it, one hot and constant, the other cold and changeable.
Astrology is a pseudo-science interpreting the supposed effect of the heavenly bodies on human existence. The sky is the home of many of the gods, who influence life on earth.
And the patterns in the sky must surely reflect that influence.
The existing calendar is a lunar one with extra months slipped in from to time in an attempt to adjust it.
In Caesar's time this calendar is three months out in relation to the seasons.
It is known from the records that in AD 139 Sirius rises on the first day of the first Egyptian month.Tags: Adult Dating, affair dating, sex dating