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The '''Moon''' is [[Earth]]'s only [[natural]] [[satellite]] and is the fifth largest [[satellite]] in the [[Solar System]]. It is the largest [[natural]] [[satellite]] in the [[Solar System]] [[relative]] to the size of its ''planet'', a quarter the [[diameter]] of [[Earth]] and 1/81 its [[mass]], and is the second densest satellite after Io. It is in [[synchronous]] [[rotation]] with [[Earth]], always showing the same face; the near side is marked with dark volcanic [http://en.wikipedia.org/wiki/Lunar_mare maria] among the bright ancient crustal [[highlands]] and prominent [http://en.wikipedia.org/wiki/Impact_crater impact craters]. Despite being the brightest object in the sky after the [[Sun]], its [[surface]] is actually very [[dark]], with a similar reflectance to coal. Its prominence in the sky and its regular [[cycle]] of [[phases]] have since ancient times made the Moon an important [[cultural]] [[influence]] on [[language]], the [[calendar]], [[art]] and [[mythology]]. The Moon's [[gravitational]] [[influence]] produces the [http://en.wikipedia.org/wiki/Ocean_tides ocean tides] and the [http://en.wikipedia.org/wiki/Tidal_acceleration minute lengthening] of the day. The Moon's current [[orbital]] distance, about thirty times the [[diameter]] of the [[Earth]], [[causes]] it to be the same size in the sky as the [[Sun]] – allowing the Moon to cover the Sun precisely in total solar [[eclipses]].

The '''Moon''' is [[Earth]]'s only [[natural]] [[satellite]] and is the fifth largest [[satellite]] in the [[Solar System]]. It is the largest [[natural]] [[satellite]] in the [[Solar System]] [[relative]] to the size of its ''planet'', a quarter the [[diameter]] of [[Earth]] and 1/81 its [[mass]], and is the second densest satellite after Io. It is in [[synchronous]] [[rotation]] with [[Earth]], always showing the same face; the near side is marked with dark volcanic [http://en.wikipedia.org/wiki/Lunar_mare maria] among the bright ancient crustal [[highlands]] and prominent [http://en.wikipedia.org/wiki/Impact_crater impact craters]. Despite being the brightest object in the sky after the [[Sun]], its [[surface]] is actually very [[dark]], with a similar reflectance to coal. Its prominence in the sky and its regular [[cycle]] of [[phases]] have since ancient times made the Moon an important [[cultural]] [[influence]] on [[language]], the [[calendar]], [[art]] and [[mythology]]. The Moon's [[gravitational]] [[influence]] produces the [http://en.wikipedia.org/wiki/Ocean_tides ocean tides] and the [http://en.wikipedia.org/wiki/Tidal_acceleration minute lengthening] of the day. The Moon's current [[orbital]] distance, about thirty times the [[diameter]] of the [[Earth]], [[causes]] it to be the same size in the sky as the [[Sun]] – allowing the Moon to cover the Sun precisely in total solar [[eclipses]].