Uploaded December 2016 | Updated September 2026, 2 days ago

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You can measure the angle of the azimuth (compass bearing) for both sunrise and sunset, on the date of the December Solstice. You can then compare that to what's predicted by the Globe Earth model, or your choice of maps for the Flat Earth model.

Azimuth Calculator (requires Google account):
docs.google.com/spreadsheets/d/1eKTC7IVXsL4C9EmPYXxnLx_hzxwXgqqclrdNwWrWxeQ/edit?usp=sharing

Flat Earth Math message boards:
flatearthmath.boards.net/board/16/december-solstice-observations