heliacal rising
81sothic cycle — noun Usage: usually capitalized S : a period of 1460 Sothic years in the ancient Egyptian calendar being the time required for the beginning of the vague year of 365 days to return to its original place in relation to the sun after retrogressing… …
82Sothic period — or Sothic cycle noun A period of 1460 years, after which the beginning of the Egyptian year of 365 days again coincides with the beginning of the Sothic year, which was reckoned from the heliacal rising of Sirius • • • Main Entry: ↑Sothic * * *… …
83Hindu chronology — The subject of Hindu chronology divides naturally into three parts: the calendar, the eras, and other reckonings. The Calendar The Hindus have had, from very ancient times, the system of lunisolar cycles, made by the combination of solar years,… …
84Solstice — For other uses, see Solstice (disambiguation). UTC date and time of solstices and equinoxes[1] year Equinox Mar Solstice June Equinox Sept Solstice Dec day time day time day time day time 2004 20 …
85Mithraic mysteries — Double faced Mithraic relief. Rome, 2nd to 3rd century AD. Louvre Museum The Mithraic Mysteries were a mystery religion practised in the Roman Empire from about the 1st to 4th centuries AD. The name of the Persian god Mithra, adapted into Greek… …
86History of astronomy — History of science …
87Egyptian astronomy — begins in prehistoric times. The presence of stone circles at Nabta Playa dating from the 5th millennium BCE, show the importance of astronomy to the religious life of Egypt even in the prehistoric period. The annual flooding of the Nile meant… …
88Pleiades — /plee euh deez , pluy /, n.pl. 1. Class. Myth. seven daughters of Atlas and half sisters of the Hyades, placed among the stars to save them from the pursuit of Orion. One of them (the Lost Pleiad) hides, either from grief or shame. 2. Astron. a… …
89Hyades — /huy euh deez /, n. (used with a pl. v.) 1. Astron. a group of stars comprising a moving cluster in the constellation Taurus, supposed by the ancients to indicate the approach of rain when they rose with the sun. 2. Class. Myth. a group of nymphs …
