tle.js - Satellite TLE tools: get lat/lon of satellites, get look angles, plot orbit lines

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tle.js is designed to simplify satellite TLEs and SGP4 with a friendly interface. The origin of TLEs goes back to the punchcard days! A TLE, or two-line element set, is used by SGP4 propagators to determine spacecraft positioning information, taking into account gravity perturbations (the moon, etc).

https://github.com/davidcalhoun/tle.js

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