Heliacal rising
The heliacal rising of a star (or other body such as the moon or a planet) occurs when it first becomes visible above the eastern horizon at dawn, ...
heliacal rising: (pron. he-le-ac-l) the instant of the earliest visibility of a star in the East at dawn. The heliacal rising of the star Sirius was used by the ancient Egyptians to predict the coming of the annual Nile flood.
heliacal rising
the period of time when an object, such as a star, is briefly seen in the eastern sky before dawn and is no longer hidden from the glare of the sun
heliosphere ...
New Zealand: Heliacal risings very often mark important calendar points for ancient peoples. The heliacal rising of the Pleiades (around June) also begins the new year for the Maori of New Zealand, who call the Pleiades Matariki.
The Egyptian culture placed a great importance on the heliacal rising of Sirius. This heliacal rising is the first time in the year when Sirius was seen in the sky just before sunrise.
During the era of the Middle Kingdom, Egyptians based their calendar on the heliacal rising of Sirius, namely the day it becomes visible just before sunrise after moving far enough away from the glare of the sun.
The importance of their heliacal risings, or first visible appearances at dawn, for the purposes both of practical life and of ritual observance, caused them to be systematically noted; ...
Heliacal risings would occur at DUSK, and heliacal settings at DAWN. (Heliacal refers to a star's first annual appearance -- or disappearance -- in the twilight, the star being lost in the Sun's glare for a portion of the year.) In addition, ...
APIN, contains catalogues of stars and constellations as well as schemes for predicting heliacal risings and the settings of the planets, lengths of daylight measured by a water-clock, gnomon, shadows, and intercalations.
 See also: Sky, Time, Sun, Star, Year
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