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    Re: Celestial Navigation on the surface of Mars
    From: Frank Reed
    Date: 2018 Dec 4, 09:59 -0800

    Here's a "Mars Local Time" puzzle. In the photo below, it should be possible to determine three things from the shadows of the rocks:

    • The approximate local hour angle of the Sun, and given that it's reported that the image was taken in AM hours, the approximate local time follows.
    • The approximate location of the Sun relative to the photo.
    • The approximate angular field of view. The shadows are parallel to each other in the real scene, but in the image they're not.

    Frank Reed

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