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

regression of nodes

Astronomy; Moon

The backwards movement of the Moons nodes relative to the direction of orbit.

revolution

Astronomy; Moon

The movement of one body around another in an orbit. A complete revolution is a complete orbit. Not to be confused with rotation.

rille

Astronomy; Moon

A valley or small canyon on the surface of the Moon.

rotation

Astronomy; Moon

The spinning of a body around its own axis. An example would be a basketball spinning on the tip of a finger.

Saber's beads

Astronomy; Moon

Detached points of light seen along the limb of very young and old lunar crescents. The striking resemblance to 2nd and 3rd contacts during a total solar eclipse was first noted by American ...

Saros cycle

Astronomy; Moon

A cycle of lunar months lasting 18 years and 11. 3 days, the time it takes the Moon, the Earth, and the Sun to return to the same position relative to each other.