Yareach is the standard Hebrew word for the moon, appearing about 26 times. It may derive from a root related to wandering or the month. The related word chodesh (new moon, month) is more common for the monthly cycle. Yareach is the poetic and descriptive term for the luminous moon itself, distinguished from the sun (shemesh). A second, less frequent term levanah (the white one) also designates the moon.
The moon in Hebrew thought is God's appointed servant — created on Day 4 "to govern the night" (Genesis 1:16) and to mark appointed times (moedim), seasons, and the sacred calendar. Unlike neighboring cultures that worshiped moon deities (Sin in Babylon), Israel was forbidden to bow down to the moon (Deuteronomy 4:19; Job 31:26–28). The moon reflects light it does not generate — a profound image of the believer's calling to reflect God's glory. Eschatologically, the moon's light will be surpassed by God's direct glory (Isaiah 60:19–20; Revelation 21:23).