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General astronomy

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General astronomy

apogalacticon

Astronomy; General astronomy

The point in a star's orbit farthest from the Galactic center.

apogee

Astronomy; General astronomy

The point at which a body in orbit around the Earth reaches its farthest distance from the Earth.

apparent magnitude

Astronomy; General astronomy

1) A measure of how bright a star looks in the sky. The brighter the star, the smaller the apparent magnitude. A star that is one magnitude brighter than another (e.g., +1 versus +2) looks 2.5 times ...

apsidal motion

Astronomy; General astronomy

Rotation of the line of apsides in the plane of the orbit; (in a binary) precession of the line of apsides due to mutual tidal distortion.

arcminute

Astronomy; General astronomy

A unit of angle equal to 1/60 of a degree.

arcsecond

Astronomy; General astronomy

One sixtieth of an arcminute, or 1/3600 of a degree.

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