Celestia is real-time 3D space simulation which lets you travel through our solar system and to over 100,000 stars in our neighborhood.

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.

Experience accessible astronomy with a real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live tracking. Easy mouse-manipulation of the sky brings planets, comets, asteroids, DSOs, and a multitude of stars to your fingertips in real-time. And let TimeLine graphically show the effects of precession down through the millennia...

Adastra Plus is a complete astronomy experience, with real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live orbital tracking. Two encyclopedic reference sources interactively link to the sky display, with planets, comets, asteroids, DSOs, and a multitude of stars. Let Sky Quiz quickly build familiarity with your local sky, as TimeLine shows the effects of precession through the millennia...