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CelesTrak - Operated by Dr. T.S. Kelso since 1985, CelesTrak has established
a credible reputation worldwide for providing educational materials and standard data to the space community such as two-line element sets,
Earth Orientation Parameters, solar weather data, geomagnetic indices, precision orbit ephemerides, and associated models and documentation.
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SOCRATES - Satellite Orbital Conjunction Reports Assessing Threatening
Encounters in Space offers a free list of top 10 possible conjunctions by maximum probability and minimum range.
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STK® - Analytical Graphics, Inc. (AGI) develops the STK software suite for
land, sea, air, and space initiatives.
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