Next New Moon Calculator

At new moon the moon sits between Earth and the sun; the near side is dark and the moon is often invisible in the night sky. New moons mark the start of a lunar cycle in many traditions and are useful for dark-sky observing windows.

Because the synodic month averages 29.53 days, new moon dates shift through the Gregorian calendar year. This tool scans forward from your chosen date to the next new moon in our model and reports how many days you wait.

Example: if you pick a date a week after new moon, the next new moon is roughly three weeks away. Lunar New Year and other cultural holidays use separate lunar-calendar rules — use the cultural calculators for those dates.