Moon phase dates by year

Reading these dates

Every instant on this page is given in UTC and is the same moment everywhere on Earth. What changes with your location is the local date and clock time: a full moon at 01:30 UTC falls on the previous evening across the Americas, which is why two calendars can list neighbouring dates for the same moon and both be right.

The four phases listed are the principal ones, the instants when the moon is exactly new, exactly half lit, or exactly full. The crescent and gibbous phases are the stretches between them, about a week each. For a night-by-night view of any month, open that month's moon calendar.

Times come from an analytic ephemeris validated against published reference tables, the same code that runs offline inside the app. There is more on how that works, and how accurate it is, in how moon apps know the moon.