Algol as Horus in the Cairo Calendar: The Possible Means and the Motives of the Observations

An ancient Egyptian Calendar of Lucky and Unlucky Days, the Cairo Calendar (CC), assigns luck with the period of 2.850 days. Previous astronomical, astrophysical and statistical analyses of CC support the idea that this was the period of the eclipsing binary Algol three millennia ago. However, next...

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Published in:Open astronomy 2018-09, Vol.27 (1), p.232-263
Main Authors: Porceddu, Sebastian, Jetsu, Lauri, Markkanen, Tapio, Lyytinen, Joonas, Kajatkari, Perttu, Lehtinen, Jyri, Toivari-Viitala, Jaana
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Language:English
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Algol
ancient Egyptian Astronomy
hemerologies
Horus
the Cairo Calendar
variable stars
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description An ancient Egyptian Calendar of Lucky and Unlucky Days, the Cairo Calendar (CC), assigns luck with the period of 2.850 days. Previous astronomical, astrophysical and statistical analyses of CC support the idea that this was the period of the eclipsing binary Algol three millennia ago. However, next to nothing is known about who recorded Algol’s period into CC and especially how. Here, we show that the ancient Egyptian scribes had the possible means and the motives for such astronomical observations. Their principles of describing celestial phenomena as activity of gods reveal why Algol received the title of Horus.
doi_str_mv 10.1515/astro-2018-0033
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subjects Algol
ancient Egyptian Astronomy
hemerologies
Horus
the Cairo Calendar
variable stars
title Algol as Horus in the Cairo Calendar: The Possible Means and the Motives of the Observations
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