Later on, they invented the first portable shadow clock which was so lightweight that people could carry it with them. Obelisks – slender, four-sided monuments – were used as sun clocks from 3500 BC and their moving shadows enabled people to separate the day into parts, starting at noon. The Egyptians were among the first to divide their days into parts. After some time, it became evident that the calendar was short, but the start of the civil year coincided with the beginning of the agricultural year. To mark the beginning of each year, they chose the rising of the Dog Star, visible to the naked eye. These three seasons each consisted of 120 days and made up one calendar year. The Egyptians divided time into three main periods: the inundation season (akhet), which lasted for one-third of the year the sowing and growth of the crops (perit) and the harvest (shemu).
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