When a star is overtaken by the Sun and is lost in its rays. The Heliacal rising or setting of the Moon occurs when it is within 17° of the Sun; other stars and planets, when within 30° distance.
ASTROLABE ENCYCLOPEDIA
Astrolabe Encyclopedia
When a star is overtaken by the Sun and is lost in its rays. The Heliacal rising or setting of the Moon occurs when it is within 17° of the Sun; other stars and planets, when within 30° distance.
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