Moon Phase Software

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Moon Phase Calculator by date

On 2026-10-31, the Moon is waning gibbous at 01:26 (UTC), 70.1% illuminated.

Start with a date. The default reading uses 12:00 UTC, the middle of that calendar day. Add an exact local time and time zone when you need a precise instant.

Calculation input

Use a named time zone so local clock changes are handled.

Physical lunar phase wheel with a photographed Moon and engraved angle scale

Calculated output

Calculated Moon state

2026-10-31T01:26+00:00[UTC] · UTC

Schematic Moon phase: waning, 70.06% illuminated at a phase angle of 246.43 degrees. This represents illuminated fraction only, not sky orientation or observer hemisphere.
Schematic illumination only — not sky orientation or observer hemisphere.

Phase at the selected instant

Waning Gibbous

waning

70.06% illuminated

Brown lunation
1284
Lunar age
20.400 days (489.59 hours)
Phase angle
246.4308°
Selected instant
2026-10-31T01:26+00:00[UTC]
UTC instant
2026-10-31T01:26:00.000Z

The phase name changes from Waning Gibbous to Last Quarter at about Saturday, 31 October 2026 at 03:21:47 UTC on this local date.