Is it possible to use the H3 grid system for celestial tilling? I want to use the (alpha, delta)=(right ascension, declinaison) coordinate system (equatorial coordinate system) to assign a point/galaxy to a tile and then collect all the points (galaxies) of a particular tile, find the neighboring tiles, and get an unique indexing of the tiles.
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This should be fine, as long as you have function to transform equatorial coordinates into lat/long coordinates. The inputs for H3 are expected to be lat/long points, specified as either degrees (for most of the bindings, e.g.
h3-jsandh3-py), or radians (for the core C library). Assuming you have a function to translate the(ascension, declination)tuple to a(lat, long)tuple, then H3 should be entirely adequate as a grid system for any spherical coordinates.The only Earth-centric aspects of H3 are:
The initial orientation of the icosahedron the grid is based on, which is optimized to place the vertices in Earth's oceans
Any functions like
hexAreaoredgeLengthwhich output units of kilometers or meters based on the Earth's radius.Other than these, the grid system should work for any spherical context.