Because a year does not consist of 365 days. No. It consists of 365 and a quarter days. As it would be stupid to reset your clocks 6 hours into the 1st January and then suddenly be all like 'It's the 2nd January!', they decided that every four years there would be a whole extra day. Hence, leap years.
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All cultures, everywhere invent a calendar of some kind.
Because of the influence it had the Roman calendar became widespread. It was not the only calendar in use at the time any more than the Gregorian one, used by most people, is not the only one in use today
It is done because it is necessary to calculate future dates for commerce and for social reasons.
He did not invent the calendar. He ordered the old Julian calendar be revised as the year was a few minutes too long and it cause problems with the date of the season changes as well as the date of Easter.
The Romans did invent a calendar. It consisted of months with 30 or 31 days, and was said to be created by Romulus.
they developed it because they needed to know when the nile would flood (may-september). They used this so people wouldn't drown and to help them build irrigation systems.
The flooding of the nile
The ancient Egyptians accomplished many things. They erected the Sphinx and pyramids, and a rich and developed civilization for the time.
the pyramids,papyrus,water powered clock,the ideal for wok with greater expandibility
no
The pyramidThe sphinxThe pots and cups made by clayWorship of the cat