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    Re: Venus mer-pass for Lat, Sun time sight for Lon.
    From: Antoine Couëtte
    Date: 2020 Apr 15, 07:55 -0700

    Hello Tony,

    You said " I should not mention my HoE while giving the HAs already cleared for the Dip. Lesson learned. " .

    Well ... maybe not .

    As long as you would mention your HoE while actually specifying that your "Ha's" are corrected for both IE and Horizon Dip, any knowledgeable Reader from any nautical culture different from yours will start on the right track should he/she wishes to re-process your data.

    Again we see the importance of publishing "raw" data, corrected for IE, or if not with applicable IC values. Then, let every interested people correct for the environment : HoE / Dip , Temperature and Pressure for refraction, then SD/parallax as applicable.

    Indeed, on a small craft tossed in bad weather and cold rain, CelNav quickly becomes a real challenge. At earlier times it could simply mean "live if you do it" or "put yourself in extra danger in you do not".

    You did extremely well under your cold and windy environment.

    Last but not least. You definitely used a high quality sextant, and it also looks like you have extremely well fine tuned it : is it a russian SNO-T sextant or equivalent ?

    Let's wait for extra results if other colleagues happen to publish somme results on their own.

    Best Regards,


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