See 2500 stars, all 88 constellations, planets and the moonphase from 4713 BC to 9999 AD from any location on earth. Click star on screen for detailed information. Geocentric and heliocentric views also available. Define your own five locations for quick switch. Print todays night sky ! Tiny program, but great planetarium, especially for teachers and students. Nice visuals, smooth animation, simple controls, good planet data too.

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.

Mac OS X 10.3+ Astrology Calculation Software (ger, eng)
SwissEphemeris, ACS Atlas (9.000/252.000 locations)
files: pdf,eps,tif,aaf,txt,rtf
topocentric, geocentric, heliocentric, tropical, sidereal (21 Anayamsas),
19 aspects, over 11400 asteroids, over 300 arabic points
14 house systems, multiple fonts
synastry, composite, combine, overlay charts, transits, harmonics, progressions, directions, return charts, planetars, eclypses, lunar occultations

Live interactive physics simulations let you explore the Solar System (orbits, seasons, gravity, tides, satellites and comets), play snooker (on a full size table) and experiment with Laws of Motion simulations. Now with machines ( pendulum clock and siege engines) bridge, crash and ideal gas simulations and experiments.

GEOPosCalc is an easy to use and powerfull tool for coordinate systems (grid) and datum conversion. It does support more than 200 predefined datums, 20 ellipsoids and 10 coordinate systemsand the ability to define your own datums and ellipsoids.

GEOPosCalc is an easy to use and powerfull tool for coordinate systems (grid) and datum conversion. It does support more than 200 predefined datums, 20 ellipsoids and 10 coordinate systemsand the ability to define your own datums and ellipsoids.