new moon 
noun
1The phase of the moon when it first appears as a slender crescent, shortly after its conjunction with the sun: owls hooted and the new moon rose...
- Every month, the first crescent of the new moon is observed, defining the beginning of the new month, whilst each year Ramadan commences 11 days earlier.
- We all speculate that we want to go at a time when the moon is a new moon.
- A solar eclipse can only occur at conjunction, and the sighting of the new moon is typically not until 30 hours later.
1.1The time when the new moon appears.From new moon to new moon, and from sabbath to sabbath, all flesh shall come to worship before me, says the LORD....
- The members organise turtle walks everyday and during full moon and new moon days, intensify the patrols.
- Isn't it ironic that you guys performed your story - which revolves around a new moon - on the night of the new moon?
1.2 Astronomy The time at which the moon is in conjunction with the sun, when it is not visible from the earth: only 31 hours before new moon...
- Syzygy of the sun, Earth, and moon occur twice a month, at the full and new moons.