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PC-SIG: World of Education
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sky5.doc
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1988-08-11
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Stars
The program reads from a catalog of several
hundreds of the brightest stars. The user can scroll
through it and make his/her selection. Star names are given
with the traditional Greek denomination (example: "ALP LIB"
= "Alpha Librae"), followed by the standard Arabic name
("ZUBENELG" = "Zubenelgenubi") and the DM number ("-15
3966"). The catalog is a selection from the "STAR1" catalog
provided with the U. S. Naval Observatory "Floppy Almanac"
(v. 1.50.88). The catalog is an ordinary ASCII file and can
be altered or amplified by the user; one can also
substitute it with another catalog using the same format.
The user can also enter the program by providing
his or her own information relative to any star; needed are
the name of the star, its Right Ascension 1950.0 or 2000.0,
its Declination 1950.0 or 2000.0 and its proper motions in
Right Ascension and Declination in arc seconds per century;
parallax, radial velocity and visual magnitude are not
necessary but can be entered as well to provide a fuller
picture.
One can leave the star routine and make changes to
the time and place input, and then return to the star
routine without having to reenter star information or scroll
through the catalog. Star positions are displayed for both
the 1950.0 equinox and the 2000.0 equinox, in addition to
the equinox of date.