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.

Industry: Astronomy

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Moon

Lunar day

Astronomy; Moon

The period of time between two successive transits of the Moon over the same meridian. The mean lunar day is 24-84 hours (1. 035 times the mean solar day). Not the same thing as a day on the Moon, ...

Longitude

Astronomy; Moon

Lines of measurement at right angles to the equator of a planet or the Moon. Measured in degrees of angle from a designated line of 0 degrees. On the Moon, 0 degrees longitude is at the centre of ...

Lunar rays

Astronomy; Moon

Visible streaks on the surface of the Moon which radiate away from some craters.

Lunartidal interval

Astronomy; Moon

The period of time between the transit of the Moon and the following high or low tide.

Lunar eclipse

Astronomy; Moon

An eclipse created by the Earth coming between the Sun and the Moon. Lunar eclipses always happen during the full moon phase.

Lunar interval

Astronomy; Moon

The difference in time between a phase of the Moon or tide occurring at the Greenwich meridian and a local meridian. This interval represents the passage of the Moon during this time.