General astronomy

General astronomy

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General astronomy

anomalistic month

Astronomy; General astronomy

The interval between two successive perigee passages of the Moon.

The point on the celestial sphere where the sun crosses the celestial equator moving northward, which corresponds to the beginning of spring in the northern hemisphere and the beginning of autumn in ...

declination

Astronomy; General astronomy

One element of the astronomical coordinate system on the sky that is used by astronomers. Declination, which can be thought of as latitude on the earth projected onto the sky, is usually denoted by ...

ephemeris

Astronomy; General astronomy

A table listing specific data of a moving object, as a function of time. Ephemerides usually contain right ascension ("R. A. " in these web pages) and declination ("Decl. " in these web pages), ...

elongation

Astronomy; General astronomy

Angular distance of a celestial object from the sun in the sky. In standard ephemerides, this is usually denoted by the Greek letter epsilon (or by the abbreviation "Elong. "). A celestial (usually ...