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+.th AZEL VI 9/22/73
+.sh NAME
+azel \*- obtain satellite predictions
+.sh SYNOPSIS
+.bd azel
+satellite ...
+.sh DESCRIPTION
+.it Azel
+predicts, in convenient form,
+the apparent trajectories of Earth satellites
+whose orbital elements are given in the
+argument files.
+If a given satellite name cannot be read, an attempt is made to find it
+in a directory of satellites maintained by the
+programs's author.
+.s3
+For each satellite given
+the program types its full name,
+the date,
+and a sequence of lines each containing a time,
+an azimuth, an elevation,
+a distance, and a visual magnitude.
+Each such line indicates that:
+at the indicated time,
+the satellite may be seen from Murray Hill at the
+indicated azimuth and elevation, and that its distance
+and apparent magnitude are as given.
+Predictions are printed only when
+the sky is dark (sun more than 5 degrees below the horizon)
+and when the satellite is not eclipsed by the earth's shadow.
+Satellites which have not been seen and verified will
+not have had their visual magnitude level set correctly.
+.s3
+All times input and output by
+.it azel
+are GMT (Universal Time).
+.s3
+The satellites for which elements are maintained are:
+.s3
+.lp +10 10
+sla,|...|sll	Skylab A through Skylab L.
+Skylabs A and B are the laboratory and its rocket
+respectively;
+the remainder are various other objects
+attendant upon its launch and subsequent activities.
+A, B, and probably K have been sighted and verified.
+.s3
+.lp +10 10
+cop	Copernicus I. Never verified.
+.s3
+.lp +10 10
+oao	Orbiting Astronomical Observatory.
+Seen and verified.
+.s3
+.lp +10 10
+pag	Pageos I.
+Seen and verified;
+fairly dim (typically 2nd-3rd magnitude), but elements are extremely accurate.
+.s3
+.lp +10 10
+exp19	Explorer 19; seen and verified,
+but quite dim (4th-5th magnitude) and fast-moving.
+.s3
+.lp +10 10
+c103b, c156b, c184b, c206b, c220b, c461b, c500b
+.br
+Various of the USSR Cosmos series; none seen.
+.s3
+.lp +10 10
+7276a	Unnamed (satellite # 72-76A); not seen.
+.s3
+.i0
+The element files used by
+.it azel
+contain five lines.
+The first line gives
+a year, month number,
+day, hour, and minute
+at which the program begins its consideration of the satellite,
+followed by a number of minutes and an interval in minutes.
+If the year, month, and day
+are 0, they are taken to be the current date (taken to change at 6 A.M. local time).
+The output report starts at the indicated epoch and
+prints the position of the satellite
+for the indicated number of minutes
+at times separated by the indicated interval.
+This line is ended by two numbers
+which specify options to the program governing
+the completeness of the report; they are ordinarily
+both ``1''.
+The first option flag suppresses output when the sky is not dark;
+the second supresses output when the satellite is eclipsed by the
+earth's shadow.
+The next line of an element file is the full name of the satellite.
+The next three are the elements themselves
+(including certain derivatives of the elements).
+The author should be consulted for more information.
+.sh FILES
+/usr/jfo/el/* \*- orbital element files
+.sh "SEE ALSO"
+sky (VI)
+.sh AUTHOR
+J. F. Ossanna
+.sh BUGS