eg 2:50min Frozen Bedford Canal & skaters
At 10km place a telescopic camera
ON THE ICE at 10cm & see if can see
skaters 10km away on the FROZEN LAKE
YOU CAN'T unless said skater is 6meters in the air above the FROZEN LAKE.
Please show a video of someone doing that experiment.
Here's the data for you:-
Click on it if you are SO CONFIDENT.
https://dizzib.github.io/earth/curve-calc/?d0=10&h0=0.1&unit=metric
At 10km the skater would have to be AT LEAST 6 meters ABOVE the ice to be seen by a telescopic camera or binoculars at 10cm about the ice.
Logic, logic, logic, plain simple geometry
