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+.TH SKY 7 bowell
+.CT 1 inst_info
+.SH NAME
+sky \- astronomical ephemeris
+.SH SYNOPSIS
+.B sky
+[
+.B -l
+]
+.SH DESCRIPTION
+.I Sky
+predicts the apparent locations of the sun, moon, visible planets,
+and stars brighter than magnitude 2.5.
+It reads one line from the standard input to obtain the desired time
+expressed as five numbers: year, month, day, hour, and minute in GMT.
+An empty line means now.
+Each object is printed with astronomical coordinates, azimuth-elevation
+coordinates relative to Murray Hill, NJ, and magnitude.
+For variable stars the maximum magnitude is printed with 
+.LR * .
+.PP
+Option 
+.B -l
+causes
+.I sky 
+to prompt for another viewing location.
+.PP
+Standard astronomical effects are accounted for:
+nutation and precession of the equinox, annual aberration, diurnal parallax,
+and proper motion.
+Atmospheric effects (extinction and refraction) are not calculated,
+nor is perturbation of the earth by other bodies.
+.PP
+In ephemeris (slighly different from civil) time, the program
+yields
+positions of sun, moon, and stars good to a few tenths of an
+arc-second.
+Planets are good to a few seconds.
+.SH FILES
+.F /usr/lib/startab
+.SH SEE ALSO
+.IR scat (7)
+.br
+.I
+American Ephemeris and Nautical Almanac
+and
+.I
+Explanatory Supplement to the American Ephemeris and Nautical Almanac