Moon & lunar calculators
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Astronomy-based moon tools: phase name and illumination for any date, countdown to the next full or new moon, days since the last new moon, and approximate moonrise/moonset from latitude and longitude. Cite USNO references — factual sky math, not horoscope text.
5 tools in this section
Moon Phase
Find the moon phase, illumination percentage, and lunar age for any date. Synodic-month estimate based on USNO-style astronomy — not for navigation.
Next Full Moon
Find the next full moon on or after any start date. Days-until countdown using a synodic-month estimate — compare with USNO tables for exact times.
Next New Moon
Find the next new moon on or after any date. Days-until countdown for lunar calendars, stargazing, and planning — synodic-month estimate.
Lunar Age
Calculate lunar age in days since the last new moon for any date. Useful for gardening folklore and moon-phase planning — synodic estimate.
Moon Rise & Set
Estimate moonrise and moonset times for a date and location. Uses astronomy-engine style calculations — approximate times for planning only.