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Diffstat (limited to 'static/v10/man7/sky.7')
| -rw-r--r-- | static/v10/man7/sky.7 | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/static/v10/man7/sky.7 b/static/v10/man7/sky.7 new file mode 100644 index 00000000..a6ce9c5b --- /dev/null +++ b/static/v10/man7/sky.7 @@ -0,0 +1,48 @@ +.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 |