1)   ActiveEarth 2.0
ActiveEarth is a world time clock with a gorgeous day/night merge of NASA's earth images in maps or a globe. It has accurate time zone data for more than 500 cities, atomic time sync, countdown clocks, scalable analog clocks, screen saver, and more!
atomic time, clock, map, globe, screen saver, astronomical,

 2)   Adastra FREESTAR 4.02
Experience accessible astronomy with a real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live tracking.
astronomy, astro, astronomical, planetarium, sky, skymap, star map, celestial atlas, coeli, stella,

 3)   AstroGrav (Windows) 1.2.2
A software program that allows you to study how astronomical objects move and interact under the force of gravity. It features superb interactive 3D graphics which allow you to move around within an astronomical system, while watching how it evolves.
AstroGrav, interactive, educational, software, program, Mac, Windows, helps, teachers, students,

 4)   Chinese Calendrics 7.01
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.
chinese, calendar, date, year, astronomy, software, moon, calendrics, lunar, solar,

 5)   AstroGrav (Mac) 1.2.2
A software program that allows you to study how astronomical objects move and interact under the force of gravity. It features superb interactive 3D graphics which allow you to move around within an astronomical system, while watching how it evolves.
AstroGrav, interactive, educational, software, program, Mac, Windows, helps, teachers, students,