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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 /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
       /sky/estartab
	      ecliptic star data

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

SOURCE
       /src/cmd/astro

SEE ALSO
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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