## Binary package “astronomical-almanac” in ubuntu precise

# astronomical almanac - calculate planet and star positions

The aa program computes the orbital positions of planetary bodies and

performs rigorous coordinate reductions to apparent geocentric and

topocentric place (local altitude and azimuth). It also reduces star

catalogue positions given in either the FK4 or FK5 system. Data for

the 57 navigational stars is included. Most of the algorithms

employed are from The Astronomical Almanac (AA) published by the

U.S. Government Printing Office.

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The aa program follows the rigorous algorithms for reduction of

celestial coordinates exactly as laid out in current editions of

the Astronomical Almanac. The reduction to apparent geocentric

place has been checked by a special version of the program (aa200)

that takes planetary positions directly from the Jet Propulsion

Laboratory DE200 numerical integration of the solar system. The

results agree exactly with the Astronomical Almanac tables from

1987 onward (earlier Almanacs used slightly different reduction

methods).

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Certain computations, such as the correction for nutation,

are not given explicitly in the AA but are referenced there. In

these cases the program performs the full computations that are

used to construct the Almanac tables (references are provided).