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    Re: The Moon and Parallax
    From: David Pike
    Date: 2019 Oct 17, 14:15 -0700

    After being warned off the Moon in my youth as being full of pitfalls for air navigators, I’m coming round giving it more attention.  After all, it’s almost impossible to misidentify.  You don’t need perfect vision to see it.  You can see it through light pollution.  You can occasionally see it in daylight, and best of all, you can often observe it from indoors through an open window.  I got comfortably set up last night and was rather impressed with the result (see photos) although I’m beginning to suspect from observing the Sun and comparing it with GPS Anti Spoof that that particular sextant is persistently recording two or three minutes high.  I had to use Air Almanac information, so I didn’t use the Nautical Almanac method for P in A.  Next steps are to use the full Nautical Almanac details if I can find a free on-line download of the daily pages.  I’ve got the bits in the back from earlier years.  After that, I’d like try it with the Hughes Mates Three Circle and my mirror AH, or maybe a bowl of water if indoors, centre on centre first, and then edge on edge.  That should be fun working out which limb I’m looking at.  Perhaps the Man might wink or smile.  DaveP




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