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This program can be used as a definitive astronomical reference, a
sight calculator or just for the daily printout of the Nautical Almanac
pages (for the full range of dates). The sights can be easily plotted
and combined. Enter the altitude and bearing and you will get the list
of potential bodies, and the ambiguous lights will get apparent
immediately. The other data available, such as twilight information,
Eclipses, Moon phases or a Star Chart, are comprehensive.