Software for astronomy, calendars and date conversion

Kazakh Nomad Calendar

Eclipses, Moon Phases and Seasons

Lunar Calendars and Eclipse Finder

Chinese Calendrics

Date‑Time Calculator

Easy Date Converter

Celtic Festivals and Cross Quarter Dates

Julian‑Gregorian‑Dee Date Calculator

For each program, clicking on the Purchase 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, or via Western Union.

Kazakh Nomad Calendar 4.17 Click on the title for the full description US$19.95, €19.25 or £16.45
For converting between dates in the Kazakh Nomad Calendar and the Gregorian Calendar. A whole month may be displayed. The starting dates of all years and months in a particular 12-year cycle may be listed, along with the number of days in each month. Read more ...

Eclipses, Moon Phases and Seasons 8.14 Click on the title for the full description US$29.95, €28.75 or £24.75
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

Lunar Calendars and Eclipse Finder 17.17 Click on the title for the full description US$19.95, €19.25 or £16.45
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

Chinese Calendrics 17.07 Click on the title for the full description US$49.95, €47.95 or £41.25
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

Date‑Time Calculator 6.04 Click on the title for the full description US$29.95, €28.75 or £24.75
Software to perform conversion, addition and subtraction of dates and times. Read more ... Top

Easy Date Converter 12.57 Click on the title for the full description US$19.95, €19.25 or £16.45
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

Celtic Festivals and Cross Quarter Dates 9.54 Click on the title for the full description US$29.95, €28.75 or £24.75
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, €19.25 or £16.45
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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