About Moon Phase Software

Moon Phase Software is a set of tools for comparing the Moon at exact past or future instants. Its calculators cover phase and orbital geometry, observer-specific sky position, and global lunar eclipse events from explicit date, time, time-zone, and location inputs.

A working astronomy desk with Moon charts, notebook and calibrated instruments

One instant, four instruments

Choose the output you need

01Phase
Angle, illumination, lunar age, direction, and adjacent principal events.
Open phase
02Distance
Geocentric range, angular diameter, libration, perigee, and apogee.
Open distance
03Position
Observer altitude, azimuth, coordinates, moonrise, moonset, and transit.
Open position
04Eclipses
Previous and next global peaks, types, obscuration, contacts, and durations.
Open eclipses