Lunar Calendar Calculator
Date
A lunar calendar calculator determines the moon's phase on any date using the 29.53-day synodic cycle. Moon phases affect tides, some wildlife, and many cultural and religious calendars.
- 1Reference new moon: 6 January 2000
- 2Days elapsed since reference mod 29.53 = phase day
- 3Illumination = (1 − cos(2π × phase/29.53)) / 2 × 100%
- 48 named phases divide the cycle
Phase day 14.77 (halfway through cycle)=Full Moon — 100% illuminated
| Phase | Approx illumination | Day in cycle |
|---|---|---|
| New Moon | 0% | 0 |
| First Quarter | 50% | ~7.4 |
| Full Moon | 100% | ~14.8 |
| Last Quarter | 50% | ~22.1 |
| New Moon again | 0% | ~29.5 |
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