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Full Version: closest approach between the Earth and Mars
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This HP Prime program estimates the approximate time of closest approach between the Earth and Mars. It uses Brent's extrema method to find the minimum geocentric distance of Mars. The software starts on January 1 of a calendar year provided by the user and searches for a maximum time of 600 days.

A PDF document which explains the technique is also included in the attached zip archive.

Additional technical information and other astronomical software examples can be found in my Dropbox repository which is located at

Orbital and Celestial Mechanics
Reference URL's