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Astronomy

The scientific study of planets, stars, black holes, comets and other celestial bodies that make up outer space.

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Astronomy > Moon

perigee

Astronomy; Moon

The point in the Moons orbit when it is closest to the Earth (opposite of apogee).

perihelion

Astronomy; Moon

The closest point to the Sun in a planetary body's orbit.

perilune

Astronomy; Moon

The closest point to the Moon in an object's orbit around it.

phases

Astronomy; Moon

When applied to the Moon, the phases refer to the different illumination that it undergoes during it's orbit around the Earth and the Sun. The most commonly known phases of the ...

quadrature

Astronomy; Moon

Term that describes two celestial bodies appearing to be ninety degrees apart, from the perspective of the observer. The position of the Moon or a planet when it is at right ...

quarter moon

Astronomy; Moon

The phase of the Moon that can be either the first quarter moon or the last quarter moon. This phase occurs when the Moon is 90 degrees away from a line between the Sun and the ...

radius

Astronomy; Moon

The linear measurement from the center of a sphere to the surface, or half of the diameter.

Sub-categories

Astrometry (117)
Astronaut (14221)
Comets (3684)
Cosmology (251)
Galaxy (567)
General astronomy (16061)
Mars (1797)
Mathematical astronomy (130)
Moon (1858)
Planetary science (7689)
Planetology (678)
Radio astronomy (37)
Solar system (663)

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