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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.
Radar using Red Pitaya for RF and Raspberry Pi 3 for quad-core signal processing. Initially used for ionospheric imaging at HF but via frequency translation could be used at microwave and other frequencies. Also can be used at low-band VHF for short-range compact radar work. To connect over Ethernet from GNU Radio to the Red Pitaya, setup an image on the Red Pitaya's micro SD card and setup GNU Radio on your Linux laptop.