How does one find source code for the SGP4/SDP4 orbital models?
The primary source for the SGP4/SDP4 orbital models is found in Spacetrack Report Number 3: Models for Propagation of NORAD Element Sets. It contains the equations for most of the model along with the associated FORTRAN source code. This document is available on the CelesTrak WWW in Adobe Acrobat Portable Document Format (PDF). The FORTRAN source code can be copied directly from this document and pasted into any text editor. There is also a LATEX version online.
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