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The brightest planet appearing in the eastern sky during morning twilight.

Related Terms

PLANET CARRIER

A fixed member in a planetary gear train that contains the shaft upon which the planet pinion rotates.

INFERIOR CONJUNCTION

The conjunction of an inferior planet and the sun when the planet is between the earth and the sun

ASPECTS

The apparent positions of celestial bodies relative to one another; particularly the apparent positions of the moon or a planet relative to the sun

LONG PERIOD PERTURBATIONS

Periodic eccentricities in the orbit of a planet or satellite which require more than one orbital period to execute one complete periodic variation.

SATURN

The navigational planet whose orbit lies outside that of Jupiter.

ELONGATION

The angular distance of a body of the solar system from the sun; the angle at the earth between lines to the sun and another celestial body of the solar system. The greatest elongation is the maximum angular distance of an inferior planet from the sun before it starts back toward conjunction. The direction of the body east or west of the sun is usually specified, as greatest elongation east (or west).

EVENING STAR

The brightest planet appearing in the western sky during evening twilight

GREATEST ELONGATION

The maximum angular distance of an inferior planet from the sun before it starts back toward conjunction, as observed from the earth. The direction of the body east or west of the sun is usually specified, as greatest elongation east (or west).

OPPOSITION

The situation of two celestial bodies having either celestial longitudes or sidereal hour angles differing by 180°. The term is usually used only in relation to the position of a superior planet or the moon with reference to the sun. The situation of two celestial bodies having either the same celestial longitude or the same sidereal hour angle is called conjunction.

PERIOD OF SATELLITE

1. See ORBITAL PERIOD. 2. As defined by the International Telecommunication Union (ITU), the time elapsing between two consecutive passages of a satellite or planet through a characteristic point on its orbit.

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