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

meridian

Astronomy; Moon

An imaginary line that passes directly north and south through an observer or specified location on Earth. A plane extended from this line into space passes through the zenith (point above the ...

meteoroid

Astronomy; Moon

A small body drifting through space. If a meteoroid is pulled into a planet's or moons gravitational field, it is called a meteor. if the meteor survives a trip through the atmosphere and lands, it ...

Moon

Astronomy; Moon

The natural satellite of the Earth or the natural satellite of any planet.

Moon rise

Astronomy; Moon

Similar to sunrise, it is the first appearance that the Moon makes over the Earth's horizon, and as such it is relative to the geographical position of the observer.

Moon set

Astronomy; Moon

The point in time when the upper limb of the Moon is even with the Earth's horizon as the Moon rises in the east.

nadir

Astronomy; Moon

An imaginary point directly under an observer on the surface of the Earth, extending through the Earth and into the sky.

neap tide

Astronomy; Moon

When the Moon is at its first quarter or last quarter, its gravitationsl forces are partially cancelled out by the Sun. This leads to a lower high tide than normal.