Estimate the moon phase age and days to the next full or new moon.
Measuring the time since a known new moon and reducing it by the synodic month gives the lunar phase age and days to key phases. Moon phase timing matters for astronomy, gardening and anyone who likes to sync activities to the lunar cycle.
Moon Phase Timing
Phase age = days since the nearest known new moon, modulo the synodic month (29.53 days)
Phase age = days since the nearest known new moon, modulo the synodic month (29.53 days) Measuring the time since a known new moon and reducing it by the synodic month gives the lunar phase age and days to key phases.
Moon phase timing matters for astronomy, gardening and anyone who likes to sync activities to the lunar cycle.
This calculator takes 3 inputs: Year, Month, Day. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.