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AstroGrav is astronomy software that allows you to simulate how astronomical objects move and interact under the force of gravity. It features superb interactive 3D graphics which allow you to move around within a many-body astronomical system, while watching how it evolves with the passage of time. A wide variety of sample files are provided, and comprehensive editing facilities allow you to create and modify your own astronomical systems.

AstroGrav is astronomy software that allows you to simulate how astronomical objects move and interact under the force of gravity. It features superb interactive 3D graphics which allow you to move around within a many-body astronomical system, while watching how it evolves with the passage of time. A wide variety of sample files are provided, and comprehensive editing facilities allow you to create and modify your own astronomical systems.

Using the same standards of accuracy as published tables but with a catalogue extending beyond Barnard's Star; it can be used to combine multiple sights, a definative astronomical reference or simply to print daily Nautical Almanac pages.

A program to convert between dates in Chinese, Vietnamese and Japanese lunar 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 Asian calendars. Can list anniversaries of lunar dates such as birthdays. Supports 60-year, 60-month and 60-day cycles, and allows searching for dates and times of full moons, dark moons, solar terms, equinoxes, solstices and more.

Chronos Atomic Clock Synchronizer is a utility for people who need their computers to use exact time. The program connects to various atomic clock timeservers and synchronizes your internal clock with time provided by these servers. Key benefits: connects on many atomic clock time servers; you can add any time server needed; improved algorithm to calculate differences between servers; calculates delays and synchronize on less than 0.1 seconds.

Animated weather radar & satellite, local temperature in tray, local weather, internet clock sync, sun and moon rise and set times, animated moon phases, planet positions in the sky, eclipses, equinox/solstice, meteors, month calendar with moon phase icons, full year calendar, 27 holidays, map, aerial photo, topographic map, start & end daylight savings, dictionary, thesaurus, calculator, unique graph of sunrise and set times for entire year.

CyberSky is an accurate, yet easy-to-use planetarium program that provides an excellent way to learn about astronomy and explore the sky visible in the distant past, the present, and the far-off future. CyberSky can display and print attractive, highly-customizable maps of the sky as seen from your home, your favorite vacation spot, or any other location on the Earth.

EarthWatch displays a beautiful graphical world clock with a dynamic map image of the world showing the day and night areas, time zone hours, a sundial, and an almanac information panel featuring sunrise/sunset times, lunar phase information, and much more -- all in real-time or time-lapse animation.

The prime purpose of Gravitorium is to let you play with ideas about gravity and gravitational systems. While it's not intended to be a highly accurate solar system simulator, at low speeds its accuracy is really pretty good. And, best of all, it lets you "play universe maker". Throw in a few extra planets, add a black hole, set a comet plunging towards the Earth! Or create an entirely new solar system from scratch.

A program to search for eclipses (lunar, solar, total, annular 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 four lunar calendars (Archetypes, Meyer-Palmen Solilunar, Hermetic Lunar Week and Liberalia Triday).

Complete 2011 Nautical Almanac in pdf format complete with monthly star charts. Includes Parallax corrections for the planets which are not normally available.

Educational orbit and gravitation simulator for high school, college and beginning university physics and astronomy. Easily create, run, print and save a simulation. Includes 30 introductory to advanced premade simulations with activities page in html-format. Uses actual pictures of planets. Plot orbits in a plane or in 3D. View time, distances, speeds, accelerations and energies as they change. Zoom and change parameters during the simulation.

StarStrider is a fully three-dimensional planetarium and 'software star ship'. You can visit not only the planets and moons of our solar system, but also hundreds of thousands of other stars. And you can view spectacular galaxies, cluster, nebulae and the milky way! Relativistic space-time effects such aberration and Doppler shift are optional. Requires a 3D-card. Anaglyph 3D-glasses (for true '3D stereo') and joystick or game pad are optional.

This shows the position of the sun and moon for any place on earth between 1900 and 2049. It can show the sun or moon for any day or the horizon which can be rotated 360 degrees and animated. A database of over 1600 locations is included which includes the name, latitude, longitude and time zone for Australasia(Australia/New Zealand), Canada, U.K. and U.S.A. Users can easily create their own database of locations.