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ASTRO(1)		    General Commands Manual		      ASTRO(1)

NAME
       astro - print astronomical information

SYNOPSIS
       astro [ -dlpsatokm ] [ -c n ] [ -C d ] [	-e obj1	obj2 ]

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  /usr/lo-
	      cal/plan9/sky/here.

       c      Report for n (default 1) successive days.

       C      Used with	-c, set	the interval to	d days (or fractions of	days).

       e      Report  distance between the centers of objects, in arc seconds,
	      during eclipses or occultations involving	obj1 and obj2.

       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 seconds).  For the sun and
	      moon,  the  magnitude is also printed.  The first	line of	output
	      presents the date	and time, sidereal  time,  and	the  latitude,
	      longitude, and elevation.

       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  IT	from  standard	input.	 IT  is	the difference between
	      ephemeris	and universal time (seconds) due to the	slowing	of the
	      earth's  rotation.   IT 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 Hale-Bopp,	C/1995 O1).

FILES
       /usr/local/plan9/sky/estartab
	      ecliptic star data

       /usr/local/plan9/sky/here
	      default latitude (N), longitude (W), and elevation (meters)

SOURCE
       /usr/local/plan9/src/cmd/astro

SEE ALSO
       scat(1)

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

								      ASTRO(1)

NAME | SYNOPSIS | DESCRIPTION | FILES | SOURCE | SEE ALSO | BUGS

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