Current moon phase, illumination percentage and a rolling 30-day lunar calendar. Uses the Julian-day algorithm for astronomical accuracy.
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How it works
The lunar cycle is 29.53 days. We compute days since a known new moon (e.g. 2000-01-06) and take the fractional cycle. Values map to standard phases (New, Waxing Crescent, First Quarter, Waxing Gibbous, Full, Waning Gibbous, Last Quarter, Waning Crescent).
Key features
- Current phase with emoji
- Illumination percentage
- 30-day calendar around today
- No dependencies on external APIs
Common use cases
Photography
Full moon nights are landscape-photographer gold.
Fishing & hunting
Lunar phase influences animal behaviour.
Gardening
Some biodynamic practices align planting with moon phases.
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Pro tips
- ◆Full moon rises at sunset — great for time-lapse shots.
- ◆New moon nights are best for stargazing.
Common mistakes to avoid
- ✕Assuming "full moon" is a single day — it's technically an instant, but appears full for about 3 days.
Frequently asked questions
How often is a full moon?▼
Once every 29.53 days on average — about 12 or 13 times per year.
What's a blue moon?▼
Traditionally the second full moon in a calendar month. Happens every 2–3 years.
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