13. Because the summit of Desierto las Palmas in Spain was seen from Camprey on the Island of Ibiza the Earth cannot be a sphere

“In a 19th century French experiment by M. M. Biot and Arago a powerful lamp with good reflectors was placed on the summit of Desierto las Palmas in Spain and able to be seen all the way from Camprey on the Island of Iviza. Since the elevation of the two points were identical and the distance between covered nearly 100 miles, if Earth were a ball 25,000 miles in circumference, the light should have been more than 6600 feet, a mile and a quarter, below the line of sight!”

Dubay uses faulty trigonometry.  Using the correct calculations we see that this scenario is perfectly possible on a spherical Earth.

A common mistake that Flat Earthers make is to calculate the drop using the 8 inches per mile squared rule and use that to represent the amount of an object that would be hidden from view.  This is just incorrect trigonometry.  It fails to take into account that the height of the observer makes a huge difference to how far away objects can be observed.


Using this example, Desierto las Palmas is 2390 feet above sea level.  Using the correct calculation, the amount of Ibiza that would be obscured is 1074 feet.   Although there is no place called Camprey or a location with an identical elevation, if we assume the highest point on Ibiza, Sa Talaiassa, which is 1558 feet above sea level,  only 1074 feet would be obscured by the curvature of the earth, making the peak visible.

In addition with typical atmospheric conditions refraction would make even more of Ibiza visible.

For details on how to calculate the visibility of an object at a distance see:  https://flatearthinsanity.blogspot.co.uk/2016/07/derivation-for-height-of-distant.html


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