The Greeks called the moon μηνη, which may be considered as a derivative from μην. Parkhurst says, This word may be derived either from μηνη, _the moon_, by the phases of which the month is reckoned, or else it may be deduced from the Hebrew מנה _manah_, _to number_, _compute_, as being computed by the lunar phases. And it is probable that the first _computations_ of time were made by the _revolutions_ of the moon. It is obvious to remark, that not only these two Greek words, but also the Latin _mensis_, a month, and the English _moon_, _month_, are ultimately derived from the same Hebrew מנה. Leigh observes, that “the Hebrews call the moon and a month by the same name, because the moon is renewed every month. The Greeks also call σεληνη, from σελας, because it every day renews its light.” Parkhurst on the word σεληνη says, “The Greek etymologists, and particularly Plato, deduce it from σελας νεον, _new light_, because its light is continually renewed.” But the learned Goguet says; “The Greeks gave to the _moon_ the name _selene_, which comes from the Phœnician word (לן or לון namely) which signifies _to pass the night_; whence also we may observe is plainly derived the Latin name of the moon, _luna_.” From _lun_ with the termination _a_, comes _luna_, and this name is given to the planet from her _changing_ or appearing under different phases. As to the _dimensions_ of the moon, according to the most accurate calculations, her diameter is 2,175 miles, the circumference 6,831 miles, the surface contains 14,898,750 square miles, and its solidity 5,408,246,000 cubical ones. Her bulk is equal to about a fiftieth part of our earth, and her mean distance from the earth is about 240,000 miles.