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The canonical references are Spacetrack Report #3Spacetrack Report #3 which is the original documentation of the SGP4 algorithm, and Vallado + Kelso's Revisiting Spacetrack Report #3Revisiting Spacetrack Report #3 which has updates, analysis and modern* source code with discussion.

* well, kinda :)

The canonical references are Spacetrack Report #3 which is the original documentation of the SGP4 algorithm, and Vallado + Kelso's Revisiting Spacetrack Report #3 which has updates, analysis and modern* source code with discussion.

* well, kinda :)

The canonical references are Spacetrack Report #3 which is the original documentation of the SGP4 algorithm, and Vallado + Kelso's Revisiting Spacetrack Report #3 which has updates, analysis and modern* source code with discussion.

* well, kinda :)

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pericynthion
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The canonical references are Spacetrack Report #3 which is the original documentation of the SGP4 algorithm, and Vallado + Kelso's Revisiting Spacetrack Report #3 which has updates, analysis and modern* source code with discussion.

* well, kinda :)