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Moon Phase Calculator

Pick any date and the calculator works out the phase of the Moon from the 29.53-day lunar cycle measured from the known new moon of 6 January 2000, plus the Moon's age in days and how much of it is lit.

\u2014Moon phase
\u2014Moon age (days)
\u2014Illumination

How to use

  1. Pick a date.
  2. Click Calculate.
  3. Read the phase, Moon age and illumination.

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