A New Sothis Rise on a Small Cylindrical Jar from the Old Kingdom (Collection of Prof. Peter A. Kaplony)
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The ointment jar from the collection of late Professor Peter A. Kaplony can be stylistically dated to the Old Kingdom, most likely to the 5 th or early 6 th Dynasty. The inscription mentions the rise of Sothis on the IV. Akhet, day 1. Since the Egyptian civil calendar shifted towards reality one day in four years, the connection of a civil calendar date with the heliacal rising of Sothis is vitally important for the reconstruction of chronology. An assumed point of observation in Memphis dates this rise of Sirius to a time window 2419 to 2411 BC, depending on the arcus visionis.