Question

how can you prove that the earth is a sphere by looking at the horizon​

Answer 1

Compare shadows

The first person to estimate the circumference of the Earth was a Greek mathematician named Eratosthenes, who was born in 276 B.C. He did so by comparing shadows case on the day of the summer solstice in what is today Aswan, Egypt, with the more northerly city of Alexandria. At noon, when the sun was directly overhead in Aswan, there were no shadows. In Alexandria, a stick set in the ground cast a shadow. Eratosthenes realized that if he knew the angle of the shadow and the distance between the cities, he could calculate the circumference of the globe.

On a flat Earth, there wouldn't have been any difference between the length of the shadows at all. The sun's position would be the same, relative to the ground. Only a globe-shaped planet explains why the sun's position should be different in two cities a few hundred miles apart.

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Answer 2

Rapper B.o.B wants to crowdfund his own satellite and launch it into space to find out, once and for all, whether the Earth is flat or round. As a flat-Earth conspiracy theorist, the Georgia-based musician is betting on flat, but his $1 million call for cash on GoFundMe has raised only about $2,000 in its first five days, the first $1,000 pledged by B.o.B himself.

Fortunately, there are plenty of cheaper ways than a satellite launch to show that the Earth is round. In the spirit of scientific inquiry, here are seven.