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    Re: Lindbergh-Weems Navigaiton Watch Gotchas
    From: Tony Oz
    Date: 2018 Oct 23, 01:47 -0700

    Dear Ed,

    Thank you for your post-script scales and very through-out descriptions.

    [an angry engineer's rant mode ON]

    Yes, as a quick and dirty hack to get the GHASun on a regular layman's watch - it works. As an instrument - a sort of NA back-up - it leaves more to be wished.

    Far too many quirks and gotchas.

    If it were me to develop such a watch - I'd do:

    • 24-hours caliber;
    • re-arranged the 15°·n scale to look like sectors between the hour-marks, so that the hour hand would lay in a relevant, clearly marked part of the scale;
    • 1-to-60 gear between the bezel and the 15°·n scale disk (a new complication), so that bezel rotation would advance or retard the 15°·n scale under the hours hand accordingly - eliminating all those gotchas present in the current design;
    • some way to obtain the declination and EoT values for the date in question, may be engraving an analemma on the back cover of the watch. Or, preferably, through another complication - to provide a calender-driven hands to directly show those values on the 24-hour face - which just nicely accommodates the 0°~23°27' range of Sun's declinations, the EoT will easily fit there too.
    • and, of-course, the vital capability to split at least the seconds' hand to eliminate the rush and confusion when reading the angles.

    Only with all those features implemented the watch may cost that much, as of now - it is a rip-off price. The current state of Lindbergh-Weems Navigaiton Watch makes it just a costume jewellery for (a special sort of) men.

     [an angry engineer's rant mode OFF]

    Thank you again for the nice article and drawings!

    Warm regards,


    60°N 30°E

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