Researching flat earth and flat earthers forced me learn a lot about how we can prove globe earth in various interesting ways.
One cool device I discovered is the Gyrotheodolite. It's a north-seeking gyrocompass, used in mining where GPS is not available and a magnetic compass would be too inaccurate.
The north-seeking effect happens only because the earth is round and rotates the way it does. Without this rotation, the gyrocompass would not work. Hence the earth is round and it rotates. QED.
One cool device I discovered is the Gyrotheodolite. It's a north-seeking gyrocompass, used in mining where GPS is not available and a magnetic compass would be too inaccurate.
The north-seeking effect happens only because the earth is round and rotates the way it does. Without this rotation, the gyrocompass would not work. Hence the earth is round and it rotates. QED.
https://en.wikipedia.org/wiki/Gyrotheodolite