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I'm creating an app to visualize the southern area of the moon from a first-person perspective. I'm trying to determine if a point on the surface is a "checkpoint," where the elevation angle to Earth is greater than the elevation angle to the horizon at the same azimuth angle (basically if the Earth if visible). However, I don't know how to calculate the elevation angle to the horizon. I initially thought of using the slope at the current point, but this doesn't work because there could be a point up ahead with a much larger slope, which would block the visibility of the Earth.

All help is appreciated!

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  • $\begingroup$ @uhoh What communities do you recommend I post it to then? $\endgroup$
    – gnawydna
    Nov 13, 2020 at 16:27
  • $\begingroup$ @uhoh bruh I did $\endgroup$
    – gnawydna
    Nov 14, 2020 at 3:28
  • $\begingroup$ didn't mean to suggest otherwise $\endgroup$
    – uhoh
    Nov 14, 2020 at 6:21

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