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    Re: R: Re: R: Solutions to Gray's 100 Problems (Problem 1-1)
    From: Parsa
    Date: 2007 Sep 27, 21:03 -0700

    I just checked the CelestNav web site:
    http://www.mobilegeographics.com/celestnav/tutorial.html#indexerror
    
    It shows under "Show Corrections" that IE is changed to I.C. by
    changing the sign.
    That page on my Palm shows a Dip correction of -2.6, and a refraction
    correction of -3.6. That accounts for +0.2' of the difference.
    The remaining +0.3' is due to the fact that it does not include the
    0.3 correction for Venus. I don't know why though.
    
    Parsa
    
    
    
    On Sep 27, 8:36 pm, Parsa  wrote:
    > George, thanks for your comments.
    > In regards to the sextant sight corrections, you may be right about
    > the difference between I.C. and IE. The text of "100 Problems" has
    > I.C.= -1.2'.
    > I assumed this to mean this was the correction to be applied, in other
    > words it is "on" the arc and therefore needs to be subtracted from the
    > sextant reading.
    > The CelestNav program has IE, and when I have a large negative value,
    > it makes Ho larger, but when I have a large positive value, it makes
    > Ho smaller. So I think it should be changed in sign.
    > When I do that I get 15 07.9', which is much closer to my 15 08.4'.
    > The difference my be from the equations used by the software and
    > rounding in the almanac table.
    >
    > I regards to the moon, yes I know it swings all over and has a lot of
    > other crazy wobbling to boot. I'll watch my table declinations and
    > signs closely.
    >
    > Thanks
    > Parsa
    
    
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