A simple experiment for flat-Earthers.

Here’s a very simple test you can do to confirm (or not) your hypothesis that our world is flat.


  • A spirit level.
  • A compass.
  • Another sort of compass.
  • A friend in a city perhaps a thousand kilometres away, at approximately the same latitude, with the same equipment.


This experiment should be performed simultaneously by two people in distant cities at approximately the same latitute, while both are in daylight.

  1. Use your compass to align your spirit level to the east and west, perhaps resting horizontally atop two chairs or some other raised items.
  2. Use the other compass to check the angle from the level to the Sun.
  3. Compare the angle from horizon to Sun with the measurement obtained by your friend.

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