Since flat earthers don't seem to understand the scientific method clearly enough to be able to set up and actually execute an experiment themselves, I will set one up for them. If what they believe is true, it should be possible to overcome atmospheric visibility affects by increasing the amount of energy put into a point source. I recommend a high powered laser, but a spotlight with an enormous amount of lumens will work as well. Pick an area that is flat and dry such as Bonneville Salt Flats or Cloncurry, Australia. Set up the transmission post and an observation post. Observe and disseminate results. Leave the apparatus in place for independent verification.
Total cost, prolly $2000. Kickstart/indigogo it if it isn't valuable enough for any single flat earther to bother with. There is no excuse. You can't prove it from your keyboard. Extraordinary claims require proof. I am calling out the flat earthers. Put up or stfu. If it isn't BS, I guarantee it will be a tourist site that will be visited in droves so you can get your lousy $2k back. No excuse.
