Moon calendar

Moon phases in July 2031

The full moon falls on 4 July 2031, within a day of perigee, so the disc is at its largest.

Phases

• Full moon4 July 2031 at 19:01 UTC357,009 km away
• Last quarter11 July 2031 at 11:50 UTC386,027 km away
• New moon19 July 2031 at 13:40 UTC406,204 km away
• First quarter27 July 2031 at 10:35 UTC380,602 km away

Perigee and apogee

The Moon's distance varies by more than 40,000 km over a month. At perigee the disc appears about 14% wider than at apogee — a difference that is obvious in a photograph and almost impossible to judge by eye, since there is nothing in the sky to compare it to.

A perigee full moon

The full moon on 4 July 2031 falls within a day of perigee on 4 July 2031, at 357,000 km. This is the configuration usually marketed as a supermoon. The effect is real but modest: the disc is a few per cent wider than an average full moon, not the dramatic difference the name suggests.

Times from an ELP-derived lunar theory, accurate to within one arcminute. Watch the phase change in the live simulation. A new moon is when a solar eclipse becomes possible; a full moon, a lunar one.