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

Anorthositic rock

Astronomy; Moon

A type of rocks found on the Moon in abundance at higher elevations which is calcium-rich.

Anomalistic month

Astronomy; Moon

The period of time it takes the Moon to pass between perigee (or apogee) passages - that is, the 27. 55455 day period during which the Moon moves from its closest (or farthest) point to the Earth, ...

Orbital eccentricity

Astronomy; Moon

The degree to which an elliptical orbit is elongated. Measured by the distance between the foci divided by the major axis.

Old crescent Moon

Astronomy; Moon

Phase of the Moon that occurs between the last quarter and the new Moon. In this phase, the Moon is visible only as a very thin crescent.

Lunar nodes

Astronomy; Moon

The imaginary points at which the orbital path of the Moon or other celestial body crosses the ecliptic.

Nodical month

Astronomy; Moon

A lunar cycle measured by the Moon moving from one node and back again which spans 27. 21222 days.

Opposition

Astronomy; Moon

A specific point in time when a moon or planet is 180 degrees away from the Sun, on the other side of the Earth. The Moon is full when it is in opposition (opposite of con, junction).