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* [http://www.amsat.org/amsat/ftp/docs/spacetrk.pdf Spacetrack Report No. 3], a really serious treatment of orbital elements from [[North American Aerospace Defense Command|NORAD]] (in pdf format) |
* [http://www.amsat.org/amsat/ftp/docs/spacetrk.pdf Spacetrack Report No. 3], a really serious treatment of orbital elements from [[North American Aerospace Defense Command|NORAD]] (in pdf format) |
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* [https://web.archive.org/web/20160326061740/http://celestrak.com/columns/v04n03/ Celestrak Two-Line Elements FAQ] |
* [https://web.archive.org/web/20160326061740/http://celestrak.com/columns/v04n03/ Celestrak Two-Line Elements FAQ] |
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* [http://ssd.jpl.nasa.gov/?horizons The JPL HORIZONS online ephemeris.] |
* [http://ssd.jpl.nasa.gov/?horizons The JPL HORIZONS online ephemeris.] Also furnishes orbital elements for a large number of solar system objects. |
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* [http://ssd.jpl.nasa.gov/iau-comm4/README Introduction to the JPL ephemerides] |
* [http://ssd.jpl.nasa.gov/iau-comm4/README Introduction to the JPL ephemerides] |
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* [https://web.archive.org/web/20160303213938/http://www.mindspring.com/~n2wwd/html/body_state_vectors.html State vectors: VEC2TLE] Access to VEC2TLE software |
* [https://web.archive.org/web/20160303213938/http://www.mindspring.com/~n2wwd/html/body_state_vectors.html State vectors: VEC2TLE] Access to VEC2TLE software |
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