Software for astronomy, calendars and date conversion
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For each program, clicking on the Purchase a license button takes you to a page where you can purchase a user license (which is valid perpetually). You can pay via credit or debit card using our payment processor Comecero. You can also pay via a donation of $10 or more.
BCE‑BC‑AD‑CE Converter 2.24US$19.95, €18.95 or £15.95 |
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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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Easy Date Converter 12.57US$19.95, €18.95 or £15.95 |
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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 ... Top |
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Celtic Festivals and Cross Quarter Dates 9.54US$19.95, €18.95 or £15.95 |
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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 ... Top |
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Lunar Calendars and Eclipse Finder 17.17US$19.95, €18.95 or £15.95 |
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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 ... Top |
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Eclipses, Moon Phases and Seasons 8.14US$19.95, €18.95 or £15.95 |
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Displays (over a range of years) the exact dates and times of partial, annular and total solar eclipses, of partial, penumbral and total lunar eclipses, of phases of the Moon, and of solstices, equinoxes and the solar cross-quarter days. Read more ... Top |
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Equinoxes, Solstices and Cross‑Quarter Days 6.27US$19.95, €18.95 or £15.95 |
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Software to calculate accurate dates and times for equinoxes, solstices and the Celtic cross-quarter days. The cross-quarter days are those midway between the equinoxes and solstices. Works for both the northern hemisphere and the southern. Read more ... Top |
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Date‑Time Calculator 6.04US$19.95, €18.95 or £15.95 |
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Software to perform conversion, addition and subtraction of dates and times. Read more ... Top |
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Julian‑Gregorian‑Dee Date Calculator 7.54US$19.95, €18.95 or £15.95 |
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Converts between Julian, Gregorian, Dee and Dee-Cecil calendar dates in various formats, does date arithmetic, and calculates northern spring equinoxes using either mean or apparent solar time. Read more ... Top |
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Chinese Calendrics 17.07US$19.95, €18.95 or £15.95 |
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A program for the scholarly study of the Chinese Calendar. It convert between dates in various Chinese calendars and dates in the Gregorian and Julian calendars, and finds lunar new year's day and leap months for any year in the Chinese Calendar. Read more ... Top |
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