Inside the superimposed rectangle is the hieratic writing for the word ‘Horus’. Credit: Lauri Jetsu
The Ancient Egyptian papyrus Cairo 86637 calendar is the oldest preserved historical document of naked eye observations of a variable star, the eclipsing binary Algol – a manifestation of Horus, a god and a king. This calendar contains lucky or unlucky prognoses for each day of one year. Researchers have performed a statistical analysis of the Cairo Calendar mythological texts. Analysis revealed the periods of Algol (2.85 days) and the Moon (29.6 days) strongly regulate actions of deities in this calendar.
“Until now, there were only conjectures that many of the mythological texts of the Cairo Calendar describe astronomical phenomena...
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