Software for astronomy, calendars and date conversion

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Date‑Time Calculator 6.04 Click on the title for the full description US$29.95, €24.45 or £21.25 for a perpetual license or US$9.95, €8.25 or £6.95 for a 3-month license
Software to perform conversion, addition and subtraction of dates and times.  Read more ...

Eclipses, Moon Phases and Seasons 8.14 Click on the title for the full description US$29.95, €24.45 or £21.25 for a perpetual license or US$9.95, €8.25 or £6.95 for a 3-month license
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

Celtic Festivals and Cross Quarter Days 9.44 Click on the title for the full description US$19.95, €16.45 or £13.95 for a perpetual license or US$6.75, €5.45 or £4.75 for a 3-month license
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

Julian‑Gregorian‑Dee Date Calculator 7.54 Click on the title for the full description US$19.95, €16.45 or £13.95 for a perpetual license or US$6.75, €5.45 or £4.75 for a 3-month license
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

Chinese Calendrics 17.07 Click on the title for the full description US$39.95, €32.75 or £28.25 for a perpetual license or US$13.25, €9.95 or £9.45 for a 3-month license
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

Easy Date Converter 12.37 Click on the title for the full description US$19.95, €16.45 or £13.95 for a perpetual license or US$6.75, €5.45 or £4.75 for a 3-month license
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

BCE‑BC‑AD‑CE Converter 2.04 Click on the title for the full description US$14.95, €12.25 or £9.95 for a perpetual license or US$4.95, €3.95 or £3.25 for a 3-month license
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 ...   Top

Lunar Calendars and Eclipse Finder 17.17 Click on the title for the full description US$19.95, €16.45 or £13.95 for a perpetual license or US$6.75, €5.45 or £4.75 for a 3-month license
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

These programs run under all versions of Windows from Windows XP to Windows 10. The freely downloadable trial versions can be made fully-functional by means of an activation key available upon purchase of a user license. Updates to new versions (if any) are free, as is tech support for the duration of the user license.
 
The developer of these programs is currently available for custom software development at an affordable rate.  If interested please leave a message here.

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