man(1) Manual page archive


     SKY(7)                      (bowell)                       SKY(7)

     NAME
          sky - astronomical ephemeris

     SYNOPSIS
          sky [ -l ]

     DESCRIPTION
          Sky predicts the apparent locations of the sun, moon, visi-
          ble 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 `*'.

          Option -l causes sky to prompt for another viewing location.

          Standard astronomical effects are accounted for: nutation
          and precession of the equinox, annual aberration, diurnal
          parallax, and proper motion.  Atmospheric effects (extinc-
          tion and refraction) are not calculated, nor is perturbation
          of the earth by other bodies.

          In ephemeris (slighly different from civil) time, the pro-
          gram yields positions of sun, moon, and stars good to a few
          tenths of an arc-second.  Planets are good to a few seconds.

     FILES
     SEE ALSO
          scat(7)
          American Ephemeris and Nautical Almanac and Explanatory Sup-
          plement to the American Ephemeris and Nautical Almanac