Contest // Topic of the week №53 // Is the earth round or flat?

Hello good morning to you all. How are you doing? I hope you are doing good by his grace. Thank you @slom21veka for this contest.

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Is the Earth flat? Short answer is no (obviously!). However, how do we have at least some idea that? Shockingly, there are still individuals who attempt and contend the Earth is flat , founded especially on things like not having the option to see a bended skyline from the shore. Incredibly, we've realized the Earth is round for more than 2000 years. The Ancient Greeks saw that the state of the Earth passing across the moon during a lunar overshadowing was a bow, and that implies the Earth must be bended.

Then, at that point, around 240 BC Eratosthenes formulated an investigation to appraise the Earth's boundary. He had caught wind of a well in Syene (presently Aswan, Egypt) where around early afternoon on the mid year solstice (21st June), the sun would be straightforwardly upward thus sparkle straight down the well, without projecting any shadow.

Eratosthenes understood that if he would gauge the point of a shadow cast by a stick around early afternoon around the same time some place a lot further north (or south), and he realized the distance to that spot, he could work out the ebb and flow of the Earth. He picked Alexandria, around 790 km from Syene (estimated by camel travel!), and he showed the point at Alexandria was around 7.2 degrees, or around 1/50 of a total circle. This implied the outline of Earth was around 50 x 790 km = 39500 km.

Goodness, and obviously, in the event that the Earth wasn't a circle (or near it), those satellites wouldn't be held in circle and would simply vanish off into space!
Thank you all for reading.
I invite @kataali @kawusada and @realib1 to join this contest.