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Using Spice data files, the Skyfield library for Python can now report lunar libration as the sub-longitude and sub-latitude of the point on the Moon facing the Earth. To take an example from its documentation: from skyfield.api import PlanetaryConstants, load ts = load.timescale(builtin=True) t = ts.utc(2019, 12, 20, 11, 5) eph = load('de421.bsp') earth, ...

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