Algol as Horus in the Cairo Calendar : the possible means and the motives of the observations

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Porceddu , S , Jetsu , L , Markkanen , T , Lyytinen , J , Kajatkari , P , Lehtinen , J & Toivari-Viitala , J 2018 , ' Algol as Horus in the Cairo Calendar : the possible means and the motives of the observations ' , Open Astronomy , vol. 27 , no. 1 , pp. 232-263 . https://doi.org/10.1515/astro-2018-0033

Title: Algol as Horus in the Cairo Calendar : the possible means and the motives of the observations
Author: Porceddu, Sebastian; Jetsu, Lauri; Markkanen, Tapio; Lyytinen, Joonas; Kajatkari, Perttu; Lehtinen, Jyri; Toivari-Viitala, Jaana
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of World Cultures 2010-2017
Date: 2018-10-05
Language: eng
Number of pages: 32
Belongs to series: Open Astronomy
ISSN: 2543-6376
URI: http://hdl.handle.net/10138/288723
Abstract: 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
Subject: Algol
Horus
ancient Egyptian Astronomy
variable stars
the Cairo Calendar
hemerologies
115 Astronomy, Space science
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