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    Re: Bubble sextant trials
    From: Bill B
    Date: 2007 Feb 15, 22:33 -0500

    Alex
    
    
    As my texts deal with marine navigation, I had surmised the fly boys with
    bubble sextants had come up with interesting ways to use the stars.
    
    > You are welcome to borrow my copy of Lecky.
    > He is a big fan of stars (and opponent of the Lunars)
    > and he advocates meridional altitudes of stars.
    > Not only upper culminations but
    > also lower culminations.
    > (Of circumpolar stars)
    > But he also writes that "soon the LOP navigation
    > will be the only method used in practice",
    > and was is right.
    
    Still interesting.
    >
    > The Russian manual of 1966 or so, has a brief discussion
    > of "near meridian" Sun altitudes, but nothing else
    > except LOP. The only reason why meridian and near meridian
    > altitudes survived to 1966 was that the reduction
    > is very simple. With the spread of calculators,
    > this last reason disappeared.
    
    I was familiar with ex-meridian sun sights with Ho adjusted to maximum via
    Bowditch tables.  The star thing sounds like fun.
    
    > In asto navigation manuals for airplanes
    > (I read the 2 volume set by Chichester
    > he wrote this before his circumnavigation when he
    > was working in the MkIX factory during WWII. Purdue
    > aerospace library has it. I can check it for you
    > if you wish)
    > he also spends a lot of time on stars
    > (rather than the Sun) emphasizing that you can have
    > an immediate fix with two stars.
    > And the stars are always visible from an airplane
    > at night, and you don't care about the horizon etc.
    
    Thanks.  I'll wait on Chichester until I work through the other
    volumes/papers we mentioned on our trip to Strictly Sail.
    
    Bill
    
    
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