Moon phase calculator
- Phase
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- Illumination
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- Age (days)
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- Next new moon
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- Next full moon
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Uses the synodic month (29.530588 days) measured from the J2000 epoch new moon (2000-01-06 18:14 UTC). Accurate to within a few hours.
About this tool
Moon phase calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Date & Time Tools. Browse more Date & Time Tools tools.