Density (earth's = 1) - 0.60419, or 3.444 the density of water (water being unity).
Surface area, about 14,600,000 square miles (earth's surface area, 196,870,000 miles)
Earth's surface area = 1, moon's - About 2/27 or 0.07407.
Action of gravity at surface - 0.16489 or 1/6.065 of the earth's.
Surface of moon never seen - 0.4100.
Surface of moon seen at one time or another - 0.5900.
Synodical revolution, or interval from new moon to new moon (commonly called a lunation) - 29 d. 12 h. 44 m. 2.684 s. - 29.5305887 days.
Sidereal revolution, or time taken in passing from one star to the same star again - 27 d. 7 h. 43 m. 11.545 s. - 27.3216614 days.
Tropical revolution, or time taken in passing from "the first point of Aries" to the same point again - 27 d. 7 h. 43 m. 4.68 s. - 27.321582 days.
Anomalistic revolution, or time taken in passing from perigee to perigee - 27 d. 13 h. 18 m. 37.44 s. - 27.55460 days.