Perihelion

Science / Astrology / Perihelion: The point in a planet's orbit that lies closest to the Sun.

Aphelion

Science / Astrology / Aphelion: The point in a planet's orbit that is most distant from the Sun. MORE

Apsides

Science / Tides and Currents / Apsides: The points in the orbit of a planet or moon which are the nearest and farthest from the center of attraction. In the Earth's orbit these are called perihelion and aphelion, and in the Moon's orbit, pe MORE

Anomaly

Science / Tides and Currents / Anomaly: As applied to astronomy, the anomaly is the angle made at any time by the radius vector of a planet or moon with its line of apsides, the angle being reckoned from perihelion or perigee in the directi MORE

Anomalistic

Science / Tides and Currents / Anomalistic: Pertaining to the periodic return of the Moon to its perigee or the Earth to its perihelion. The anomalistic month is the average period of the revolution of the Moon around the Earth with respect to MORE

Elongation

Science / Astrology / Elongation: The distance of a planet from the Sun, as viewed from Earth. The maximum elongation for the inferior planets is 28° for Mercury, and 48° for Venus. Mercury can therefore only form a conjunction and MORE

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