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| <tr><td width=20><td><b>ASTRO(1)</b><td align=right><b>ASTRO(1)</b> |
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| <p><font size=+1><b>NAME </b></font><br> |
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| astro – print astronomical information<br> |
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| <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> |
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| <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> |
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| </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> |
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| </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> |
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| </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> |
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| </table> |
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| </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> |
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| <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> |
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| </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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