Algol As Horus in the Cairo Calendar 233 Radius Than Algol A
Open Astron. 2018; 27: 232–264 Research Article Sebastian Porceddu*, Lauri Jetsu, Tapio Markkanen, Joonas Lyytinen, Perttu Kajatkari, Jyri Lehtinen, and Jaana Toivari-Viitala Algol as Horus in the Cairo Calendar: the possible means and the motives of the observations https://doi.org/10.1515/astro-2018-0033 Received Feb 15, 2018; accepted May 04, 2018 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 Keywords: Algol, Horus, ancient Egyptian Astronomy, variable stars, the Cairo Calendar, hemerologies 1 Introduction dated to 1271-1163 B.C. (Bakir 1966, p2-5), (Van Walsem 1982, p233) and (Helck et al. 1975–1992, p156), and pub- lished by Abd el-Mohsen Bakir. As in all our three pre- The ancient Egyptian texts known as the Calendars of vious studies (Porceddu et al. 2008; Jetsu et al. 2013; Lucky and Unlucky Days, or hemerologies, are literary Jetsu and Porceddu 2015), we use only the best preserved works that assign prognoses to each day of the Egyptian continuous calendar which is found on pages recto III- year (Wells 2001a, p117-118), (Leitz 1994, p1-2) (Bacs XXX and verso I-IX of papyrus Cairo 86637.
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