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    Re: Basic celestial naviagtion using a scientific calculator
    From: Douglas Denny
    Date: 2010 Aug 13, 14:20 -0700

    I would suggest finding a 'simple' _programmable_ scientific calculator.

    I'm sorry I am not familiar with modern calculators to suggest a particular model, but there must be relatively cheap yet simplified programmable types available.

    This will, with a little practice which will be worthwhile, enable you to put in at least some simple expressions to reduce input difficulties such as DegreesMmSs into decimal degrees; and then to use simple programmed formulae to obtain your sight reductions without too much effort for programming or when in use.

    I do _not_ recommend the more complicated programmable calculators like the HP50G I use, which can be a nightmare until you are used to the special programming language.
    By coincidence, I am currently entering the Moon's basic orbital parameters from Meeus' book to obtain almanac data for the Moon for use as an 'eternal' almanac, but it takes ages to programme for this. (Sir Isaac Newton declared working on the equations for the Moon was the only thing that gave him a headache! - I know why now!)

    I have already done this for the Sun, Aries, stars, Julian Date, Equation of Time etc, which was quite easy. Once done though - there it is - always available in a hand-held device, (so long as the batteries work).

    Douglas Denny.
    Chichester. England.
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