In standard atmospheric conditions, for an observer with eye level above sea level of 5 feet 7 inches, the horizon distance is about 3.1 miles. The variables that go into determining the longest possible sightline are; height of the observer, height of the object being observed, air temperature and clear line of sight. The longest theoretical sightline on earth 334 miles, from Mt. Dankova in Krgyzstan to Hindu Tagh in China. The furthest photographed sightline in the world in the world is 275 miles from Pic de Finestrelles in the Spanish Pyrenees to Pic Gaspard in the French Alps. |
Travelling the longest sightline on earth at 32 times the speed of sound. Total distance of 443 km, from Pic de Finestrelles in the Spanish Pyrenees to Pic Gaspard in the French Alps
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