Calculate the moon phase and its effects.
Select a date to see the moon phase.
Time affects precise illumination.
The Moon Phase Calculator shows the current shape of the Moon as seen from Earth. The phase depends on the Moon's position relative to the Sun and Earth.
Simply enter a date (and optional time) to see the moon's phase, illumination percentage, and age for that specific moment.
Calculations are based on astronomical algorithms. The visual representation is a simulation; the exact orientation of the crescent depends on your location (Northern or Southern Hemisphere).