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    Re: Nautical Almanac
    From: Jean-Philippe Planas
    Date: 2018 Aug 11, 11:08 +0000
    On Saturday, August 11, 2018, 8:33:03 AM GMT+2, Sean C <NoReply_SeanC@fer3.com> wrote:


    Hi Mike,

    I recommend a program called AstroNav by NavSoft. For about $25 (£20 or €22), about the cost of a Nautical Almanac Commercial Edition for one year, you get a program which can generate N.A. pages for any year between 9999 B.C. and 9999 A.D. (Although the accuracy for dates so far in the future is questionable.) The generated pages match the layout of the official N.A. almost exactly. One notable exception is that the diagram showing the phase of the Moon is "reversed", as it would appear in the southern hemisphere. I've checked the program against a few pages from the official N.A. and the data seldom differs - and if it does, it's usually only by 0.1'. Attached is an example. The program has a few other very handy features. You can download a free trial (limited to one year, I think) to see everything it can do.

    If you want higher precision/accuracy, I recommend the Multi-year Interactive Computer Almanac or "MICA" by the U.S. Naval Observatory. It's very slightly more expensive and 'only' good for dates between 1800 and 2050, but it provides many more types of data, at higher precision, than AstroNav. And, of course, you can always use the FREE data services on the USNO website. (See "Celestial Navigation Data" near the bottom of the page.) This is essentially the same as MICA, but online and free.

    Cheers,

    Sean C.


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