Place a date within the 29.53-day synodic cycle and visualize the approximate lunar phase.
Estimated phase
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Illumination-
Moon age-
Cycle progress-
Next new moon-
Next full moon-
Synodic cycle29.5306 days
Method
Time and calendar calculation method
Stopwatch elapsed time uses a monotonic high-resolution browser clock. Calendar results use Gregorian and ISO rules, while lunar and solar results apply documented mean-cycle and coordinate formulas.
Astronomical output is an estimate. Coordinates, elevation, refraction, local terrain, the entered UTC offset, and the simplified lunar model can change observed or high-precision event times.
Questions
Moon Phase Calculator FAQ
How accurate is the moon phase estimate?
It uses a standard mean synodic cycle anchored to a known new moon. It is suitable for general planning, not high-precision astronomical observation.
Why is moon phase similar worldwide?
The geometric phase is nearly the same at a given instant worldwide, though local date, rise time, orientation, weather, and visibility differ.
