Distance and apparent size
Calculate geocentric distance, apparent angular diameter, libration, and the adjacent perigee and apogee events.
Moon calculators for exact dates and locations
Start with one precise local instant to calculate phase angle, illumination, lunar age, waxing or waning direction, and the previous and next principal phases. Distinct tools add orbital geometry, observer-specific sky position, and global lunar eclipse searches. Inputs are supported from 1900 through 2100.
Calculate an exact instant
Current default instant in UTC
- Phase
- Waning Gibbous
- Illuminated fraction
- 82.67%
- Direction
- waning
- Calculated instant
This preview uses the current default UTC minute. Change the form inputs to inspect the exact past or future instant you need.
More calculated Moon tools
Position from a location
Use latitude and longitude to calculate altitude, azimuth, equatorial coordinates, and the next rise, set, and upper transit.
Lunar eclipse finder
Bracket an exact instant with the previous and next global lunar eclipse peaks, including eclipse type, obscuration, and durations.
Calculation basis
Inputs are converted from the named time zone to UTC before the astronomical calculation. Read the calculation methodology and the reference sources for scope and limits, or review what the toolset covers.
Looking for a calendar-first or printable monthly product? Visit the contextual UK Moon Calendar.