User:Immanuelle/Ancient Egyptian Day
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In Ancient Egypt the day began at sunrise. The day was 24 hours long, but it used unequal hours [de; en] so each day had 12 equal day hours when the sun was up, and 12 equal night hours when the sun was down. Their length was different in different times of the year[1]
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Day in hieroglyphs | |||
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Re Rˁ Day | |||
The Ancient Egyptian Day began at sunrise |
The first day of the month in the Ancient Egyptian Lunar Calendar [de; en:draft; en] began on the day of the disappearance of the Crescent Moon in the dawn before sunrise. Since the last night hours belonged to the old day, the invisibility of the moon was a reliable signal immediately before the rising sun. At new moon, sighting a crescent moon is generally not possible, as the moonrise occurs almost simultaneously with the sun without crescent formation, and the new light moon cannot be seen with the naked eye.
The ancient Egyptian day always dated over the period of two Julian or Gregorian days. Heliacal risings [de; en] of stars always belonged to the old day, which is why they are to be backdated by one day in the Julian or Gregorian calendar. For example, if Sirius as the signal for the Nile Flood had its heliacal rising on June 20, this event in the ancient Egyptian calendar still counted for June 19. According to this definition, the arrangements of the Diagonal Star Clocks [de; en] and the entries in the Book of Nut [de; en] are made. There, all visible Decans [de; en] are divided into the phases of heliacal rising, acronychal [de; simple] culmination, and acronychal setting and assigned to an ancient Egyptian day: "One Decan dies (acronychal setting) and another lives (heliacal rising) at the beginning of a Decan [de; en]."[2]