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<title>astro(1) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>ASTRO(1)</b><td align=right><b>ASTRO(1)</b>
<tr><td width=20><td colspan=2>
<br>
<p><font size=+1><b>NAME </b></font><br>
<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
astro – print astronomical information<br>
</table>
<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>astro</font></tt> [ <tt><font size=+1>−dlpsatokm</font></tt> ] [ <tt><font size=+1>−c</font></tt> n ] [ <tt><font size=+1>−C</font></tt> d ] [ <tt><font size=+1>−e</font></tt> <i>obj1 obj2</i> ]<br>
</table>
<p><font size=+1><b>DESCRIPTION </b></font><br>
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<i>Astro</i> reports upcoming celestial events, by default for 24 hours
starting now. The options are:<br>
<tt><font size=+1>d</font></tt> Read the starting date. A prompt gives the input format.<br>
<tt><font size=+1>l</font></tt> Read the north latitude, west longitude, and elevation of the
observation point. A prompt gives the input format. If <tt><font size=+1>l</font></tt> is missing,
the initial position is read from the file <tt><font size=+1>/usr/local/plan9/sky/here</font></tt>.<br>
<tt><font size=+1>c</font></tt> Report for <i>n</i> (default 1) successive days.<br>
<tt><font size=+1>C</font></tt> Used with <tt><font size=+1>−c</font></tt>, set the interval to <tt><font size=+1>d</font></tt> days (or fractions of days).<br>
<tt><font size=+1>e</font></tt> Report distance between the centers of objects, in arc seconds,
during eclipses or occultations involving <i>obj1</i> and <i>obj2</i>.<br>
<tt><font size=+1>p</font></tt> 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
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moon, the magnitude is also printed. The first line of output
presents the date and time, sidereal time, and the latitude, longitude,
and elevation.<br>
</table>
<tt><font size=+1>s</font></tt> Print output in English words suitable for speech synthesizers.<br>
<tt><font size=+1>a</font></tt> Include a list of artificial earth satellites for interesting
events. (There are no orbital elements for the satellites, so
this option is not usable.)<br>
<tt><font size=+1>t</font></tt> 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.<br>
<tt><font size=+1>o</font></tt> Search for stellar occultations.<br>
<tt><font size=+1>k</font></tt> Print times in local time (‘kitchen clock’) as described in the
<tt><font size=+1>timezone</font></tt> environment variable.<br>
<tt><font size=+1>m</font></tt> 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).<br>
</table>
<p><font size=+1><b>FILES </b></font><br>
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<tt><font size=+1>/usr/local/plan9/sky/estartab<br>
</font></tt>
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ecliptic star data<br>
</table>
<tt><font size=+1>/usr/local/plan9/sky/here<br>
</font></tt>
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default latitude (N), longitude (W), and elevation (meters)<br>
</table>
</table>
<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/cmd/astro<br>
</font></tt>
</table>
<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man1/scat.html"><i>scat</i>(1)</a><br>
</table>
<p><font size=+1><b>BUGS </b></font><br>
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The <tt><font size=+1>k</font></tt> option reverts to GMT outside of 1970-2036.<br>
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