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    Re: Moonrise over Connecticut, 19 October 2021
    From: Frank Reed
    Date: 2021 Nov 15, 04:32 -0800

    Antoine, going back to last month and your original post on this topic, you suggested:
    "Latitude can be roughly - probably within 1° - determined through noticing that "Mare Crisium" on the Moon is about 33° right of the vertical. I do not have the applicable system/software to derive it."

    Yes, that's what I was getting at. While it's a low-resolution latitude, it's the sort of thing that could give us confidence that a photo is real and not manufactured. The polar axis of the Moon points very nearly to the north ecliptic pole, and on this date under the circumstances at moonrise, that's something that can be estimated rather accurately even without direct computation. I had prepared an image last month showing the difference in the orientation of Mare Crisium for latitudes of 51°, 41°, and 31°, but I didn't get around to posting it. I'm at last adding it below to illustrate the change. Note that this image is manufactured --three simulations in Stellarium.

    Frank Reed


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