In spreadsheet by pmh099 (Peter Hakel) website github Astron USNO Web clone for moon, planets, bright stars, polaris, which is provided by Reed Navigation skycalc notes JB astronomical almanac Nautical Almanac 2010 by USNO hgus1294 HMNAO facebook 1 facebook 2 IAU in 2000 resolution: Why astronomers are suspicious: sidereal time seems to have gone... ... and so have equinox and ecliptic: why? ... the new zero point for right ascension is something elusive called a "non-rotating origin" The History of Celestial Navigation : Rise of the Royal Observatory and Nautical Almanacs slideplayer computer nautical almanac Toyama maritime college, Japan 2001