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Simulate objects AstroGrav (Mac) 2.0.1 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.

fascinating looking for a visual illustration for elementary school education on planetary motion. could not imagine a better product. for those of us who are not professional astronomers, a summary input window for variables might be useful.

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

Excellent. Would help me to use the now historical method of astro navigation, except that I can\'t print the data.

Complete 2010 Nautical Almanac in pdf format 2010 Nautical Almanac 1.2010 Complete 2010 Nautical Almanac in pdf format. Includes star charts with the planet's positions for each month.

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