Software for astronomy, calendars and date conversion

Lunar Calendars and Eclipse Finder

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A program to search for eclipses (lunar, solar, total, annular and partial), to calculate the phase of the Moon at any given date and time and to convert between dates in the Gregorian and Julian calendars and dates in various lunar calendars: Meyer-Palmen Solilunar, Hermetic Lunar Week, etc. Read more ...

The Chinese Calendar: Dates of New Years, Dark Moons and Solar Terms

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A program for the study of the Chinese Calendar. It convert between dates in various Chinese calendars and dates in the Gregorian and Julian calendars, and (among other things) finds lunar new year dates and leap months for any year in the Chinese Calendar. Read more ...

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Easy Date Converter

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Adds a number of days or months to a date, calculates the number of days between two dates (with or without weekend days), and converts among Common Era (Gregorian) dates, Julian dates, ISO 8601 Week dates, Hermetic Leap Week dates, Julian day numbers and day-in-year dates of the form yyyy-ddd. Bilingual: English and German Read more ...

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Celtic Festivals and Cross Quarter Dates

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A program to find the exact dates and times, and zodiac positions, of full moons and dark moons, lunar Celtic festivals (Imbolc, Beltane, Lughnasadh and Samhain), equinoxes and solstices, and solar cross-quarter days. Moreover, it can do this for any range of years between 1600 and 2099. Read more ...

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BCE‑BC‑AD‑CE Converter

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Converts between calendar dates in BCE, BC, AD and CE date formats, and adds/subtracts a number of days, weeks, months and years to/from a given date. Read more ...

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