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    Re: Exercise: Lower Transit
    From: Peter Hakel
    Date: 2009 Sep 19, 15:56 -0700

    I did not know how to interpret the Temp/pressure correction, so I just used standard conditions.  This is apparently another piece of terminology that I have yet to learn...

    This way I obtain the following coordinates of your vessel at the moment of observation:
    N 31 deg 28.7'
    W 74 deg 11.8'

    At that moment the GP of Kochab was:
    GHA: 254 deg 11.8'
    Dec: N 74 deg 07.1'

    The (west) longitude is given by the GHA minus 180 for lower transits.

    The altitude of the Pole (i.e. latitude) is the sum of the Ho (15 deg 35.8') and Kochab's colatitude (polar distance = 90 - Dec = 15 deg 52.9').

    Peter Hakel

    From: "Anabasis75@aol.com" <Anabasis75@aol.com>
    To: NavList@fer3.com
    Sent: Saturday, September 19, 2009 3:08:53 PM
    Subject: [NavList 9806] Exercise: Lower Transit

    A ship is sailing in the North Atlantic. on 15 September 2009.
    At 04h 09m 44s local time a lower meridian transit of the star Kochab was
    taken by moonlight.  Hs is 15 deg 50.3'
    Height of eye is 103 feet
    Index correction is -1.2'
    Temp/pressure correction is +.2
    ZD is +4
    The 1930 Star fix from the previous evening is
    Lat 30 deg 48.9' North
    Long 073deg 22.2' West
    Crs is 304  Spd 8.2 Knots
    Determine a 0409 Latitude.

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