astro(7) [plan9 man page]

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 starting 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), declination (degrees, minutes, seconds), azimuth (degrees), elevation (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 modified (in the source) to refer to an approaching comet but in steady
	      state usually refers to the last interesting comet (currently 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)

Check Out this Related Man Page

xy2sky(1)						      General Commands Manual							 xy2sky(1)

Name
       xy2sky - Compute RA Dec from X Y using WCS in FITS and IRAF image files

Synopsis
       xy2sky [-vbjg] [-n ndec] file.fts x1 y1 ... xn yn
       or
       xy2sky [-bdjgv] [-n ndec] file.fts @listfile

Description
       xy2sky  (pronounced X-Y-to-sky) is a utility for getting the world coordinates of a set of image coordinates in a FITS or IRAF image. World
       coordinate system (WCS) information in the image header describes, in a standard way, the relationship between sky  coordinates	and  image
       pixels. This information is used by the program to transform image coordinate (X,Y) pairs to right ascension and declination sky coordinate
       pairs. The current version of the program prints the coordinates at the same equinox as is given in the image header, but  future  versions
       will  allow transformations to B1950/FK4, J2000/FK5, or galactic coordinates. Input and output files in the Starbase format will eventually
       be allowed.

Options
       -a     Append input line after output position

       -b     B1950 (FK4) output

       -d     RA and Dec output in degrees

       -e     Output in ecliptic longitude and latitude in degrees.

       -f <number>
	      Set third dimension for 3-D projections such as CSC

       -g     Galactic longitude and latitude output

       -i     First column is star id; 2nd, 3rd are x,y position

       -j     J2000 (FK5) output

       -m <number>
	      Set mode for output of LINEAR WCS coordinates:  0: x y linear 1: x units y units 2: x y linear units units

       -n <number>
	      Number of decimal places in output RA seconds

       -q <year>
	      Output equinox if not 2000 (-j) or 1950 (-b)

       -t     Output as tab-separated table

       -v     More descriptive output -z Use AIPS classic projections instead of WCSLIB

See Also
       sky2xy(1)

Author
       Doug Mink, SAO (dmink@cfa.harvard.edu)

6 July 2001							     WCSTools								 xy2sky(1)

Linux and UNIX Man Pages

astro(7) [plan9 man page]

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