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Planet Orbits ScreenSaver 

Screensaver that shows a 3D random arbitrary solar system that shows planets with random orbits and textures from real solar system planets and imaginary planets around the sun
planet orbit solar sun star universe freeware noads

Freeware 0.93MB

Chinese Calendrics 

A program to convert between dates in various Chinese calendars and dates in the Gregorian and Julian calendars, and to find lunar new year's day and leap months for any year in the Chinese Calendar.
delta t calculation converter astronomical calculator phase zhong qi solar

Shareware $19 1.76MB

World Almanac 

The World Almanac displays solar and lunar data for every 30 minutes throughout the day in addition to the times of rise, set and twilight as well the lunar phase. Includes database of towns for Australasia(Aus/NZ), Canada. UK and USA.
astronomy sunrise sunset moonrise moonset phase solar lunar

Shareware $39 3.19MB

Lunar Calendars and Eclipse Finder 

A program to search for eclipses (lunar, solar, total, annual and umbral), 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.
conversion goddess lunar calendar liberalia triday calendar solilunar calendar julian calendar gregorian calendar julian day number astronomy

Shareware $19 1.76MB

StarStrider 

StarStrider is a software planetarium that utilizes the latest in 3D-technology in order to show you not only the planets and satellites of our solar system, but also galaxies, nebulas, and hundreds of thousand of stars - in real-time 3D.
trek education science astrovarium time relativistic doppler software

Shareware $49.95 13.08MB