Helical rising <Back to Last Page>     <Full Glossary>

Definition: The helical rising of a star is its first appearance in the Eastern sky at dawn. Over a sidereal year, the star will rise earlier and earlier until it sets at dawn, followed a period of 70 days when it is no longer visible by dawn, before the cycle begins again.

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Ancient Egypt: the Father of Time
The way in which we divide the day into hours and minutes, as well as the structure and length of the yearly calendar, owes much to pioneering developments in ancient Egypt.

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