Astronomy. the approach or occurrence of conjunction between two celestial bodies.
Origin: 1620–30; < Latin appulsus driven to, landed (past participle of appellere), equivalent to ap-ap-1 + pul- (variant stem of pellere to drive, push) + -sus, variant of -tus past participle suffix
the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years
one fourth of the moon's monthly revolution
the Twins, a zodiacal constellation between Taurus and Cancer containing the bright stars Castor and Pollux
the particular appearance presented by the moon or a planet at a given time
a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue
any of the small bodies, often remnants of comets, traveling through space: when such a body enters the earth's atmosphere it is heated to luminosity and becomes a meteor