The lastest fashionable gadget, on the flat Earth
is an infrared filter placed in front of the lense of the camera or camcorder
which would finally finally see the distant horizon.
JTolan is the prophet of the infrared filter
and hos videos, which claim to demonstrate that the Earth is flat, are all the rage.
But JTolan is, like all the flattards, a dunce in geometry.
The crazy and excentric Flat Earthers
In his last video, he believes he has seen Hudson Bay from a plane flying over Saint-Louis, Missouri.
So avisual horizon at 1900 km distance!
On his film, we can clearly see the top of the clouds.
We also clearly distinguish the visual horizon.
And, during this sequence, the lake Mark Twain, Missouri, is visible.
JTolan takes care of indicating the position of the plane: 10 039 m altitude and its GPS position.
Thus the plane is about 70 km of the lake Mark Twain.
On a flat Earth, the horizon always rises to eye level.
If JTolan sees Hudson Bay, this one will be so almost as close to his eyes level
(There is a difference of 0,3 ° that I will neglect).
Mark Twain Lake will be 8 ° below the horizon of the flat Earth.
JTolan films with a SONY AX53 camcorder
whose minimum focal lenght is 4,4 mm, equivalent to 26,4 mm in full format.
This represents a horizontal field of view of 68.6 °.
In this image, 8 ° above lake Mark Twain, positions the horizon of the flat Earth here, over the cloud layer.
This is a proof that the Earth is not flat.
On a spherical Earth, the visual horizon is located below the astronomical horizon (which corresponds on the horizon of flat Earth).
At an altitude of 10 000 m, the visual horizon lowered 3,2 ° relative to the astronomical horizon.
On the image of JTolan, 3,2 ° below the astronomical horizon, it corresponds exactly with the visual horizon which I had positioned with the naked eye.
From his part, Kevin Merida compared a frame of JTolan's film with Google Earth.
He managed to match the image for a aircraft at an altitude of 10600 m and an angle of horizontal field of 68 °.
JTolan never filmed Michigan Lake, nore Hudson Bay.
The horizon is approximately 350 km and not 1900.
He simply observed and filmed our good old spherical Earth.
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