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

1.1     ! root        1: .th SKY VI 9/22/73
        !             2: .sh NAME
        !             3: sky \*- obtain ephemerides
        !             4: .sh SYNOPSIS
        !             5: .bd sky
        !             6: .sh DESCRIPTION
        !             7: .it Sky
        !             8: predicts the apparent locations
        !             9: of the Sun, the Moon, the planets out to Saturn,
        !            10: stars of magnitude at least 2.5,
        !            11: and certain other celestial objects
        !            12: including comet Kohoutek and M31.
        !            13: .it Sky
        !            14: reads the standard input to obtain
        !            15: a GMT time typed
        !            16: on one line with blanks separating
        !            17: year, month number, day, hour, and minute;
        !            18: if the year is missing the current year is used.
        !            19: If a blank line is typed the current time is used.
        !            20: The program prints the
        !            21: azimuth, elevation, and magnitude
        !            22: of objects which are above the horizon
        !            23: at the ephemeris location of Murray Hill
        !            24: at the indicated time.
        !            25: .s3
        !            26: Placing a ``1'' input after the minute entry
        !            27: causes the program to print out the Greenwich Sidereal
        !            28: Time at the indicated moment and
        !            29: to print for each body
        !            30: its right ascension and
        !            31: declination as well as its azimuth and elevation.
        !            32: Also, instead of the magnitude,
        !            33: the geocentric distance of the body, in units the program
        !            34: considers convenient, is printed.
        !            35: (For planets the unit is essentially A. U.)
        !            36: .s3
        !            37: The magnitudes of Solar System bodies are not calculated
        !            38: and are given as 0.
        !            39: The effects of atmospheric extinction
        !            40: are not included;
        !            41: the mean magnitudes
        !            42: of variable stars are marked with ``*''.
        !            43: .s3
        !            44: For all bodies, the program takes into account
        !            45: precession and nutation of the equinox,
        !            46: annual (but not diurnal) aberration, diurnal
        !            47: parallax,
        !            48: and the proper motion of stars (but not annual parallax).
        !            49: In no case is refraction included.
        !            50: .s3
        !            51: The program takes into account perturbations
        !            52: of the Earth due to the Moon, Venus, Mars, and Jupiter.
        !            53: The expected accuracies
        !            54: are:
        !            55: for the Sun and other stellar bodies
        !            56: a few tenths of seconds of arc;
        !            57: for the Moon (on which particular care is lavished)
        !            58: likewise a few tenths of seconds.
        !            59: For the Sun, Moon and stars the accuracy is sufficient
        !            60: to predict the circumstances of eclipses and occultations
        !            61: to within a few seconds of time.
        !            62: The planets may be off by several minutes of arc.
        !            63: .s3
        !            64: Information about the program
        !            65: may be obtained from its author.
        !            66: .sh FILES
        !            67: /usr/lib/startab, /usr/lib/moontab
        !            68: .sh "SEE ALSO"
        !            69: azel (VI)
        !            70: .br
        !            71: .ft I
        !            72: American Ephemeris and Nautical Almanac,
        !            73: .ft R
        !            74: for the appropriate years;
        !            75: also, the
        !            76: .ft I
        !            77: Explanatory Supplement to the American Ephemeris
        !            78: and Nautical Almanac.
        !            79: .ft R
        !            80: .sh AUTHOR
        !            81: R. Morris

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