Astronomical calculations


The Celtic Wheel Horologium β€” indicates the current positions of the sun, moon, and stars, as well as the date with respect to the solstices, equinoxes, and cross-quarter days.  Use it to find the current sidereal and solar times, and the dates and times of the solar holidays and moon phases.

An Old English Lunisolar Calendar β€” based on first quarter moons πŸŒ“ beginning with the one before Yule.  This evening will be .

Sunset Calculator β€” enter your latitude and longditude and get sunset times for the whole year.

Solar and Lunar Data β€” current moon phase () and relative size, and the positions of the earth and moon in their orbits.

Solar Events Calculator β€” solstices, equinoxes, and cross-quarter days, all at your fingertips.

Moon Phase Calculator β€” what moon phase were you born under?

Moon Perigee and Apogee Calculator β€” find the next supermoon.

Calculations are based on the β€œhigher accuracy” equations in Astronomical Algorithms, second edition, by Jean Meeus, and the full VSOP87 data set.  They are much more accurate than spreadsheet calculations.

Maya Hieroglyphs

The Maya Long Count Calendar

Today is   in the Maya long count calendar.
Convert dates to and from long count dates, and see the wheels of the calendar round turn.

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