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    Re: How to pre-calculate for negative altitudes?
    From: Frank Reed
    Date: 2017 Oct 23, 09:41 -0700

    Tony, you wrote:
    "As I expected - it is a try-and-error process with several inter-dependent variables."

    Hmm... What do you mean? I don't see that... Can you give an example?

    "If I had a time machine - I'd certainly pay a visit to Mr Claudius Ptolemy with my Freiberger, Casio fx-85ES Plus and a watch I recently found on a flee-market. :)"

    Is that a solar-powered calculator, too? Otherwise, Professor Ptolemy will be perplexed a few months after you return to the far-off future! ;) The temporal police would hunt you down, of course. That calculator, delivered to the man who was effectively the Roman Empire's "Imperial Astronomer", would surely find its way to military use. Would it lead to the development of ballistics? Or would they just use it to cast better horoscopes for the emperor? Either way, that magic box will make mayhem in the timelines!

    You added:
    "Regarding the SR/SS-tables: apart from the Calcutainment™ I hope to practice all sorts of emergency navigation as a lesson during a normal non-emergency yachting vacations. A friend of mine is a captain on a hire yacht, he is interested in my navigation studying."

    Ooooh! Very nice. Yes, it's always good if you have a patron with a big boat. You can sign on officially as ship's calcutainer.

    Frank Reed

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