Time, Date, Navigation & Astronomy

Moon Phases, Seasons & Tides Calculators

Lunar phase and rise/set timing, the instants of equinoxes and solstices, and the tide timing that follows the Moon. Used by astronomers, photographers, anglers, mariners and gardeners.

3 calculators in this category

Moon Phase CalculatorMeeus, Astronomical Algorithms, chapters 48 and 49Give this calculator any date and time and it returns the Moon's age in days since the last new moon, the percentage of the…
Next Full Moon & New Moon CalculatorMeeus, Astronomical Algorithms, chapter 49 (phases of the Moon)Pick a reference date and a phase, and this calculator returns the exact instant that phase next occurs — in Universal Time, in…
Equinox & Solstice Date CalculatorMeeus, Astronomical Algorithms, chapter 27 (equinoxes and solstices)An equinox or solstice is the instant the Sun's apparent geocentric longitude reaches an exact multiple of 90° — 0° in March…

More time, date, navigation & astronomy categories

Date Math & Business Calendars Clock Time, Elapsed Time & Time Zones Calendar Systems & Timestamps Sunrise, Twilight & Sun Geometry Celestial Mechanics & Orbits Stellar Distance, Light & Brightness Telescopes & Astrophotography Navigation, Coordinates & Celestial Position