The changing sky · Lunar dates
Full Moon in December 2026
The full Moon occurs at the following time. Your local calendar date can differ.
Full Moon · UTC
See every Moon phase in December 2026
What the time means
The full Moon is a calculated instant when the Moon and Sun differ by 180° in geocentric ecliptic longitude. The date above uses UTC and the time is shown to the minute.
Convert that instant to your time zone before adding it to a local calendar. A late-night UTC event may fall on the next day where you live.
This is a phase time, not a moonrise time. Visibility also depends on your location and conditions.
Why a month can have two dates or none
Calendar months and lunar cycles have different lengths. We keep every full-Moon instant in the UTC month instead of choosing one to represent it.
The monthly calendar shows the other primary phases. The previous and next month links stay within the published calendar window.
Calculation source and limits
astronomy-engine 2.1.19 · moon-phases-v1. Dates come from Astriel's calculation backend when this page is requested.
The linked daily sky page uses 12:00 UTC for that date, which can differ from the full-Moon instant.
U.S. Naval Observatory phase tables and time conventions · Astriel's calculation methods
A phase date does not establish a personal prediction. For the Moon's placement at birth, use the natal Moon calculator.