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NAME
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astro – print astronomical information
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SYNOPSIS
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astro [ −dlpsatokm ] [ −c n ] [ −C d ] [ −e obj1 obj2 ]
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DESCRIPTION
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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 /usr/local/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), declination
(degrees, minutes, seconds), azimuth (degrees), elevation (degrees),
and semidiameter (arc seconds). For the sun and moon, the magnitude
is also
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printed. The first line of output presents the date and time,
sidereal time, and the latitude, longitude, and elevation.
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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 ΔT from standard input. ΔT is the difference between ephemeris
and universal time (seconds) due to the slowing of the earth’s
rotation. ΔT 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
Hale-Bopp, C/1995 O1).
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FILES
SOURCE
SEE ALSO
BUGS
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The k option reverts to GMT outside of 1970-2036.
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