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    Re: Help with Lunar distance.
    From: Jeremy C
    Date: 2010 May 13, 10:43 EDT
    Don't get down on poor Jupiter.  I took a Jupiter lunar on the 6th of May with a bit more Ds (40 degrees or so) and got less than 30 seconds of time error.
     
    Using the Stark Tables is a trip.  I don't carry them with me to sea, but still use them on occasion at home to remind myself how much i don't like using tables for Lunars.  To be fair, I sometimes do the same with HO 229 for LOP's.  I am fine with using the NA, but don't much like reduction tables.  I much prefer calculators and computers to do the math for me.
     
    Jeremy
     
    In a message dated 5/10/2010 3:26:14 A.M. Bangladesh Standard Time, pw.jackson@xtra.co.nz writes:
    Thanks George i will look into the apparent altitude difference. For my next Lunar I will use another body.

    --- On Mon, 10/5/10, George Huxtable <george@hux.me.uk> wrote:

    From: George Huxtable <george@hux.me.uk>
    Subject: [NavList] Re: Help with Lunar distance.
    To: NavList@fer3.com
    Date: Monday, 10 May, 2010, 9:08 AM

    Quite a lot seems wrong here. From that given location of 36º 48'S, 174º
    46'E (somewhere near Hamilton, NZ?), at 18h 15m 52s GMT on Greenwich date 9
    May 2010, my Skymap program tells me that the apparent altitude of the
    Moon's centre is 33º 54.8', not 20º 33.9', and that of Jupiter to be 39º
    52.2, not 22º 02.6.

    Why do we disagree so greatly? Have the correct position/date/time been
    entered into Paul's navigator program? Or by me, into mine?

    By the way, those are not ideal circumstances for taking a lunar. With such
    a small lunar distance, it can happen that the body sighted is way off the
    direction of travel of the Moon through the star background, as it is in
    this case. That detracts somewhat from the accuracy of a lunar. However,
    Paul's difficulties are more serious than that.

    George.

    contact George Huxtable, at  george@hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    ----- Original Message -----
    From: "Paul Jackson" <pw.jackson@xtra.co.nz>
    To: <NavList@fer3.com>
    Sent: Sunday, May 09, 2010 8:23 PM
    Subject: [NavList] Help with Lunar distance.


    I took a Lunar distance  in position - 36 48.0 S - 174 46.0 E @ 9 Days 18
    hours 15 min 52 sec on the 9th of may 2010.
    Calculated  Alt moon 20 33.9
    Calculated Alt Jupiter 22 02.6
    Distance near limb moon & Jupiter = 7 20.8

    My Navigator software gives me a lunar time of  2:57:42 GMT how can this
    be, can you guys at Nav List Help.
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