The Ancient Egyptians had a limited knowledge of astronomy. Part of the reason for this is that their geometry was limited, and did not allow for complicated mathematical computations. Evidence of Ancient Egyptian disinterest in astronomy is also evident in the number of constellations recognized by Ancient Egyptians. At 1100 BC, Amenhope created a catalogue of the universe in which only five constellations are recognized. They also listed 36 groups of stars called decans. These decans allowed them to tell time at night because the decans will rise 40 minutes later each night. Theoretically, there were 18 decans, however, due to dusk and twilight only twelve were taken into account when reckoning time at night. Since winter is longer than summer the first and last decans were assigned longer hours. Tables to help make these computations have been found on the inside of coffin lids. The columns in the tables cover a year at ten day intervals. The decans are placed in the order in......
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