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一年365天是古埃及测定出来的.埃及人很早就对天象有很细致的观测,譬如他们曾将赤道附近的星分为36组,每组管10天,所以叫旬星,当一组旬星在黎明前恰好升到地平线上时,就标志着这一旬的到来.他们定三旬为一月,四月为一季,三季(洪水季、冬季和夏季)为一年.这就是埃及最早的历法.在古王国时代,他们就发现,一年中当天狼星(埃及人称天狗
365 days a year was measured in ancient Egypt. The Egyptians had very early observations of the celestial bodies. For example, they divided the stars near the equator into 36 groups, each of which was managed for 10 days. The ten-pointed stars will mark the arrival of this ten-day period just before dawn. They are scheduled for January, April for the season, and three seasons (flood season, winter and summer) for one year. This is The earliest calendar in Egypt. In the time of the ancient kingdom, they discovered that on the day of the year the wolf stars (Egyptians called Tengu