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# pkg_add py3-sgp4
> Python implementation of SGP4 satellite tracking algorithm
Maintainer: The OpenBSD ports mailing-list <ports at openbsd dot org>
This Python package computes the position and velocity of an earth-orbiting satellite, given the satellite's TLE orbital elements from a source like https://celestrak.com/. It implements the most recent version of SGP4, and is regularly run against the SGP4 test suite to make sure that its satellite position predictions agree to within 0.1 mm with the predictions of the standard distribution of the algorithm. This error is far less than the 1-3km/day by which satellites themselves deviate from the ideal orbits described in TLE files.
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