Urgh, flat earthers - had my fair share of run-ins with them.
The one guy I was "engaging" with seems to want to be convinced the earth is flat so that he can then justify his distrust in governments, or any other social authority. Admittedly, he has a history of alternative beliefs.
It's like arguing with a cross between a religious zealot and a 9/11 truther - facts don't feature.
I gave up after trying to debunk one of their popular assertions that the "horizon always rises to eye level", which supposedly proves a flat earth. Their method of measurement involves a spirit level and a cardboard tube. Considering that the angles we are talking about here are very small, this is not exactly the proper way of doing things.
So, I set out with a theodolite, calibrated, took measurements at sea level, and then hiked up a mountain carrying the damn thing, and again calibrated and took measurements. The horizon drop from horizontal is plain to see.
It took me ages to capture all my workings, with video references, calculations of what to expect and verification of same, etc. etc.
When I presented the results, I was asked one question: does the theodolite have a lens? Yes, I replied. Well, there's your problem, lenses distort the horizon, your results are invalid. WTF? Even after I had carefully explained how calibration negates any lens effects.
Ah well, at least I had fun
My take on flat earth theory? See my sig line.
The one guy I was "engaging" with seems to want to be convinced the earth is flat so that he can then justify his distrust in governments, or any other social authority. Admittedly, he has a history of alternative beliefs.
It's like arguing with a cross between a religious zealot and a 9/11 truther - facts don't feature.
I gave up after trying to debunk one of their popular assertions that the "horizon always rises to eye level", which supposedly proves a flat earth. Their method of measurement involves a spirit level and a cardboard tube. Considering that the angles we are talking about here are very small, this is not exactly the proper way of doing things.
So, I set out with a theodolite, calibrated, took measurements at sea level, and then hiked up a mountain carrying the damn thing, and again calibrated and took measurements. The horizon drop from horizontal is plain to see.
It took me ages to capture all my workings, with video references, calculations of what to expect and verification of same, etc. etc.
When I presented the results, I was asked one question: does the theodolite have a lens? Yes, I replied. Well, there's your problem, lenses distort the horizon, your results are invalid. WTF? Even after I had carefully explained how calibration negates any lens effects.
Ah well, at least I had fun
My take on flat earth theory? See my sig line.

