Software for astronomy, calendars and date conversion
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For each program clicking on the Purchase button takes you to a page where you can purchase a user license which is valid perpetually or (at 1/3rd the price) for just 3 months. You can pay using credit/debit card, amazon pay or bitcoin.
BCE‑BC‑AD‑CE Converter 2.04US$14.95, €12.45 or £9.95 for a perpetual license |
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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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Julian‑Gregorian‑Dee Date Calculator 7.54US$29.95, €25.25 or £21.75 for a perpetual license |
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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$35.95, €29.95 or £26.25 for a perpetual license |
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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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Lunar Calendars and Eclipse Finder 17.17US$14.95, €12.45 or £9.95 for a perpetual license |
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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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Easy Date Converter 12.37US$14.95, €12.45 or £9.95 for a perpetual license |
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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 Days 9.44US$19.95, €16.75 or £14.45 for a perpetual license |
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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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Date‑Time Calculator 6.04US$23.95, €19.95 or £17.45 for a perpetual license |
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Software to perform conversion, addition and subtraction of dates and times. Read more ... Top |
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Eclipses, Moon Phases and Seasons 8.14US$29.95, €25.25 or £21.75 for a perpetual license |
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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 6.17US$14.95, €12.45 or £9.95 for a perpetual license |
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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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The developer of these programs is currently available for custom software development at an affordable rate. If interested please leave a message here.