The moon (Heb.: יָרֵחַ yareach; Greek: σελήνη selene) is a local body in the heavens that provides a measure of light during the darkness of night. With the sun and stars it was set in place near the Earth on the fourth day of the creation week. In appearance it is about the same size in the sky as the sun. Because of this, it is called a ruler of the night. Its regular travels around the earth form phases ranging from "new" to "full" allowing for the measurement of periodic divisions of the year called by a form of its name, namely, months.