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Annotation of researchv10dc/dist/man/v4/man6/azel.6, revision 1.1

1.1     ! root        1: .th AZEL VI 9/22/73
        !             2: .sh NAME
        !             3: azel \*- obtain satellite predictions
        !             4: .sh SYNOPSIS
        !             5: .bd azel
        !             6: satellite ...
        !             7: .sh DESCRIPTION
        !             8: .it Azel
        !             9: predicts, in convenient form,
        !            10: the apparent trajectories of Earth satellites
        !            11: whose orbital elements are given in the
        !            12: argument files.
        !            13: If a given satellite name cannot be read, an attempt is made to find it
        !            14: in a directory of satellites maintained by the
        !            15: programs's author.
        !            16: .s3
        !            17: For each satellite given
        !            18: the program types its full name,
        !            19: the date,
        !            20: and a sequence of lines each containing a time,
        !            21: an azimuth, an elevation,
        !            22: a distance, and a visual magnitude.
        !            23: Each such line indicates that:
        !            24: at the indicated time,
        !            25: the satellite may be seen from Murray Hill at the
        !            26: indicated azimuth and elevation, and that its distance
        !            27: and apparent magnitude are as given.
        !            28: Predictions are printed only when
        !            29: the sky is dark (sun more than 5 degrees below the horizon)
        !            30: and when the satellite is not eclipsed by the earth's shadow.
        !            31: Satellites which have not been seen and verified will
        !            32: not have had their visual magnitude level set correctly.
        !            33: .s3
        !            34: All times input and output by
        !            35: .it azel
        !            36: are GMT (Universal Time).
        !            37: .s3
        !            38: The satellites for which elements are maintained are:
        !            39: .s3
        !            40: .lp +10 10
        !            41: sla,|...|sll   Skylab A through Skylab L.
        !            42: Skylabs A and B are the laboratory and its rocket
        !            43: respectively;
        !            44: the remainder are various other objects
        !            45: attendant upon its launch and subsequent activities.
        !            46: A, B, and probably K have been sighted and verified.
        !            47: .s3
        !            48: .lp +10 10
        !            49: cop    Copernicus I. Never verified.
        !            50: .s3
        !            51: .lp +10 10
        !            52: oao    Orbiting Astronomical Observatory.
        !            53: Seen and verified.
        !            54: .s3
        !            55: .lp +10 10
        !            56: pag    Pageos I.
        !            57: Seen and verified;
        !            58: fairly dim (typically 2nd-3rd magnitude), but elements are extremely accurate.
        !            59: .s3
        !            60: .lp +10 10
        !            61: exp19  Explorer 19; seen and verified,
        !            62: but quite dim (4th-5th magnitude) and fast-moving.
        !            63: .s3
        !            64: .lp +10 10
        !            65: c103b, c156b, c184b, c206b, c220b, c461b, c500b
        !            66: .br
        !            67: Various of the USSR Cosmos series; none seen.
        !            68: .s3
        !            69: .lp +10 10
        !            70: 7276a  Unnamed (satellite # 72-76A); not seen.
        !            71: .s3
        !            72: .i0
        !            73: The element files used by
        !            74: .it azel
        !            75: contain five lines.
        !            76: The first line gives
        !            77: a year, month number,
        !            78: day, hour, and minute
        !            79: at which the program begins its consideration of the satellite,
        !            80: followed by a number of minutes and an interval in minutes.
        !            81: If the year, month, and day
        !            82: are 0, they are taken to be the current date (taken to change at 6 A.M. local time).
        !            83: The output report starts at the indicated epoch and
        !            84: prints the position of the satellite
        !            85: for the indicated number of minutes
        !            86: at times separated by the indicated interval.
        !            87: This line is ended by two numbers
        !            88: which specify options to the program governing
        !            89: the completeness of the report; they are ordinarily
        !            90: both ``1''.
        !            91: The first option flag suppresses output when the sky is not dark;
        !            92: the second supresses output when the satellite is eclipsed by the
        !            93: earth's shadow.
        !            94: The next line of an element file is the full name of the satellite.
        !            95: The next three are the elements themselves
        !            96: (including certain derivatives of the elements).
        !            97: The author should be consulted for more information.
        !            98: .sh FILES
        !            99: /usr/jfo/el/* \*- orbital element files
        !           100: .sh "SEE ALSO"
        !           101: sky (VI)
        !           102: .sh AUTHOR
        !           103: J. F. Ossanna
        !           104: .sh BUGS

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