Awesome GitHub RepositoriesSpherical Projections

Stellarium is an open-source 3D planetarium simulator and cross-platform sky map used for astronomical observation and study. It provides a real-time simulation of the night sky that renders astronomical objects and atmospheric conditions using OpenGL. The software functions as a visualization tool to show how stars and planets appear through optical instruments. It allows users to identify celestial objects from any location on Earth, simulate stargazing site visibility, and plan targets for observation with binoculars or telescopes. The system incorporates an atmospheric scattering model,

H3 is an open-source library that provides a hierarchical hexagonal grid system for geospatial indexing. It projects the Earth onto an icosahedron and tiles each face with hexagons to minimize distortion, then encodes each hexagon as a 64-bit integer that stores its resolution and position in the hierarchy. This integer encoding enables fast bitwise operations for grid navigation and spatial analysis. The library offers a comprehensive set of grid topology algorithms for computing neighbor relationships, distances, and paths between cells directly on the hexagonal grid without geographic coor