debunking flat earth theory of seeing lighthouses

Through this, I believe I’ve gained some form of insight into their thinking. I’ve found myself bound in debate with them for hours, trying to explain how the Earth is round – something most wouldn’t bother with and simply blow them off. My exposure to this theory came from speaking to Facebook friends of a Facebook friend. We have Yet, in a day when we have not only traversed the globe but do it on a regular basis, and in which we have pictures of the Earth from the moon, there are not only people who still believe the Earth is flat, but their numbers are growing. Of course, there is the classic example of a ship coming or going over the horizon where the masts are seen first and last as the hull and deck drop below the horizon first. Eratosthenes was able to estimate the circumference of the Earth in 240 BCE by measuring the difference in the angle at noon during the summer solstice between Alexandria and Syene, a city along the equator where there was no shadow cast at that time. While, by no means alone in making the initial discovery, the ancient Greeks noted how, during a lunar eclipse – where the Earth is between the Moon and Sun – the Earth’s shadow upon the moon is round, telling them that the Earth isn’t flat.

It seems odd to have to write this – humanity has known for millennia that the Earth is round.

Debunking flat earth theory of seeing lighthouses