Moon wird, wenn damit der Erdmond gemeint ist, in der Regel groß geschrieben. Das Weglassen des Artikels erscheint mir ungebräuchlich.
Main Entry: 1moon Listen to the pronunciation of 1moon
Etymology: Middle English mone, from Old English mōna; akin to Old High German māno moon, Latin mensis month, Greek mēn month, mēnē moon
Date: before 12th century
1 a often capitalized
: the earth's natural satellite that shines by the sun's reflected light, revolves about the earth from west to east in about 291⁄2 days with reference to the sun or about 271⁄3 days with reference to the stars, and has a diameter of 2160 miles (3475 kilometers), a mean distance from the earth of about 238,900 miles (384,400 kilometers), and a mass about one eightieth that of the earth —usually used with the