Alcyone Ephemeris is an accurate and fast astronomial ephemeris calculator covering the period 3000 BC to AD 3500. It calculates heliocentric, geocentric, and topocentric positions of the Sun (Earth), Moon, and planets in ecliptical, equatorial, and horizontal coordinates, with optional corrections for parallax and refraction; rectangular coordinates, velocity, acceleration, apparent diameter, magnitude, phase, lunar libration and more.

The largest selling Indian Vedic astrology software with comprehensive charts and predictions, Horoscopes, marriage match making, yearly progressed horoscope, birth charts, planetary transits and a host of other features. Available in 7 languages. Has support for PDF export, email of horoscopes, printing on any printer, beautiful layouts, colour printouts etc.

Planet's Orbits (for Windows 98/ME/2000/XP) is an accurate digital orrery with a wealth of functionality. The program uses the DE404 ephemeris (accurate for dates between 2000 B.C. and 6000 AD) for the calculation of planetary (except Pluto) and lunar positions. The calculation of the positions of the satellites of Jupiter, Saturn, and Uranus is done by the various analytic theories given in the Explanatory Supplement to the Astronomial Almanac.

Planetary Defense is a space strategy game where you take charge of a planets defenses against waves of attacking aliens. Defend against missiles, multiple warhead rockets, cloaked starships, meteors, homing missiles and laser-armed satellites. Some of the 21 missions include orbiting moons complete with colonies, defensive shield grids, radar bases and evacuating starships. Superb graphics and low system requirements, only a 3MB download.

Real stars and galaxies in 3D and full color. Move and look in any direction. Easy to use with keyboard shortcuts and presets. 9,000 stars (all visible stars, plus lots of nearby dim stars) and 2,400 galaxies. Displays known planetary star systems. Find stars and galaxies by name and fly to them with a keypress. Select stars by magnitude, distance, or spectral type. Select galaxies by distance or group. Has an outline of our galaxy.