Moon Phase Today
What the moon looks like tonight — computed live from today's date. No input needed; just open the page.
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Illumination
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Moon age
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Next new moon
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Next full moon
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How it is calculated
The moon returns to the same phase every 29.530588853 days — one synodic month. This tool measures the time passed since a known new moon (6 January 2000, 18:14 UTC), divides by the synodic month, and takes the remainder as the moon's age. The age gives the phase name, the illumination percentage, and the dates of the next new and full moon. The drawing above shows the lit part of the moon exactly as it appears for the current phase: the right side is lit while the moon is waxing, the left side while it is waning.
How to use
- Open the page — today's moon phase loads automatically.
- Read the phase name, illumination and moon age.
- Check the next new moon and next full moon dates below the moon.
- Come back any night — the moon updates itself every day.
Frequently asked questions
The top of this page shows the current moon phase, updated automatically from today's date — no input needed. It includes the phase name, illumination percentage and moon age.
It uses the standard astronomical synodic month of 29.530588853 days measured from a known new moon reference, which is accurate to within a day for everyday use.
The dates of the next new moon and the next full moon are shown above, calculated live from the current moon age.
Yes. It is free, needs no signup, and runs entirely in your browser.