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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).
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).
astronomical-almanac for Debian ------------------------------- astronomical-almanac looks for its initialization information in three places: ./aa.ini ~/.aa.ini /etc/aa.ini You may want to adjust the default values in the site-wide file /etc/aa.ini, or else make a local copy and make changes there. The example files conjunct and moonrise had their inputs compiled in. I have adapted co more»
#!/bin/sh # (1) aa.que contains test questions. To submit them to aa, type: aa < aa.que >test.ans # aa.ans has the corresponding answers (not necessarily true, but what # the program says) # (2) For another example, visit Steven Wepster's site: # # http://www.math.uu.nl/people/wepster/ldtab.html # # Celestial navigation is normally done with the benefit of an accurate # clock. Howev more»
plan404 ephemerides The tables of coefficients were derived by a least squares fit of periodic terms to JPL's DE404 ephemerides. The periodic frequencies used were determined by spectral analysis and comparison with VSOP87 and other analytical planetary theories. The least squares fit to DE404 covers the interval from -3000 to +3000 for the outer planets, and -1350 to +3000 for the inner plane more»
AA(1) AA(1) NAME aa - astronomi more»
CONJUNCT(1) CONJUNCT(1) NAME conjunct - find more»
astronomical-almanac (5.6-3) unstable; urgency=low * debian/control: move homepage reference to H more»
This package was debianized by James R. Van Zandt <email@example.com> on Sun, 20 Aug 2006 16:05:34 -040 more»