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ASTRO(7)               Miscellaneous Information Manual               ASTRO(7)



NAME
       astro - print astronomical information

SYNOPSIS
       astro [ -dlepsatokm ] [ -cn ]

DESCRIPTION
       Astro reports upcoming celestial events, by default for 24 hours start-
       ing now.  The options are:

       d      Read the starting date.  A prompt gives the input format.

       l      Read the north latitude, west longitude, and  elevation  of  the
              observation  point.   A  prompt gives the input format.  If l is
              missing,  the  initial  position   is   read   from   the   file
              /lib/sky/here.

       c      Report for n (default 1) successive days.

       e      Report fractional overlap during eclipses.

       p      Print  the  positions  of  objects at the given time rather than
              searching for interesting conjunctions.  For each, the  name  is
              followed  by the right ascension (hours, minutes, seconds), dec-
              lination (degrees, minutes, seconds), azimuth (degrees),  eleva-
              tion (degrees), and semidiameter (arc minutes).  For the sun and
              moon, the magnitude is also printed.

       s      Print output in English words suitable for speech synthesizers.

       a      Include a list of artificial earth  satellites  for  interesting
              events.   (There  are no orbital elements for the satellites, so
              this option is not usable.)

       t      Read T  from  standard  input.   T  is  the  difference  between
              ephemeris and universal time (seconds) due to the slowing of the
              earth's rotation.  T is normally calculated  from  an  empirical
              formula.  This option is needed only for very accurate timing of
              occultations, eclipses, etc.

       o      Search for stellar occultations.

       k      Print times in local time (`kitchen clock') as described in  the
              timezone environment variable.

       m      Includes  a  single comet in the list of objects.  This is modi-
              fied (in the source) to refer to an  approaching  comet  but  in
              steady  state usually refers to the last interesting comet (cur-
              rently Levy, 1990c).

FILES
       /lib/sky/estartab
              ecliptic star data

       /lib/sky/here
              default latitude (N), longitude (W), and elevation (meters)

SOURCE
       /sys/src/cmd/astro

SEE ALSO
       scat(7)

BUGS
       The k option reverts to GMT outside of 1970-2036.



                                                                      ASTRO(7)