Moon

Moon

The Earth's only natural satellite. The moon has a cold, dry orb covered with many lunar craters and strewn with rocks and dust. The moon has no atmosphere. But recent lunar missions have found plenty frozen water on the moon.

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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 Moon include full ...

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 angles to the Sun. The ...

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 Earth. In the ...