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poliastro is an open source pure Python package dedicated to problems arising in Astrodynamics and Orbital Mechanics, such as orbit propagation, solution of the Lambert's problem, conversion between position and velocity vectors and classical orbital elements and orbit plotting, focusing on interplanetary applications.
EinsteinPy is an open source pure Python package dedicated to problems arising in General Relativity and relativistic physics, such as geodesics calculation for vacuum solutions for Einstein's field equations, calculation of various quantities in these geometries like Schwarzschild Radius and the event horizon. The library also has functions for Symbolic calculations in GR like Christoffel Symbols and much more is planned.
A script get_third_party.sh is included to download and build the third-party dependencies on unix-like operating systems. The plots generated by the examples are done using the pyplot-fortran module. The git repo includes pyplot-fortran as a submodule, and it will automatically be included when building with FoBiS.
I decided to port the SGP4 library to GoLang as one of my first projects with the language. I've included a test suite to ensure accuracy. Calc julian date given year, month, day, hour, minute and second the julian date is defined by each elapsed day since noon, jan 1, 4713 bc.