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    Re: R: Re: R: Solutions to Gray's 100 Problems (Problem 1-1)
    From: Parsa
    Date: 2007 Sep 27, 11:57 -0700

    Well, I figured out where I went wrong with the moon....
    Any guesses?
    The same thing my physics students do... sign error!
    Declination, declination, declination. It's more important for
    calculated height.
    First mistake: I did not examine the almanac to note that declination
    was decreasing, which it does in May. I should have subtracted 7.7
    minutes instead of adding.
    Second mistake: I also did not note that for LHA=336 degrees the
    difference was going down as declination increased. In other words I
    ignored the little negative sign. It was given on the nearby d values,
    but not on the one I looked at, so I added to the tabulated height
    when I should have subtracted.
    Third mistake: I did not even add the right number. I used the
    declination for the hour instead of the corrected declination for
    hours and minutes.
    When I fixed everything, I was very close (about one minute) to the
    value on my PDA.
    Now the LOP for the moon is acceptable.
    I won't make that mistake again soon.
    On to the next problem...
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