of the reference frames used (ICRS, FK5). Theories of precession, nutation, and Earth rotation .
It covers topics from calendars and coordinate transformations to planetary ephemerides and physical ephemerides of solar system bodies.
It aids in understanding how computational techniques changed over time.
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The work is a collaborative effort, with major contributions from the , His Majesty’s Nautical Almanac Office (HMNAO) , and the Jet Propulsion Laboratory (JPL) . Key Features of the Third Edition (2013)