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A hectaëteris is the Greek name for the period over 100 tropical years (also known as a tropical century or hectade or centade) where the Moon phase occurs over 5 days later. It corresponds to 1,237 synodic months, 1,337.0100713736433 sidereal months, 1,342.387255070837 draconic months, 1,325.7098123607332 anomalistic months, and 36,529.337310185234 days.
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