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Orekit is a free low level space dynamics library written in Java. It provides basic elements (orbits, dates, attitude, frames, ...) and various algorithms to handle them. Homepage: https://www.orekit.org/

Alternative implementation of orekit python wrapper based on jpype

Tutorials for the Orekit library

Rugged is an add-on for Orekit handling Digital Elevation Models contribution to line of sight computation. It is a free software intermediate-level library written in Java. Homepage: https://www.orekit.org/rugged/