How I destroyed Flat Earth idiocy (1) – Water finds its level ?

Earth is Flat... Really ? In June 2018, I installed my Celestron C90 telescope in Ranquet Creek on the edge of the Pond of Berre, France. And I observed the real world... A few weeks earlier, I installed my Celestron C70 telescope on Pier 14, and I observed the real world on the other side of San Francisco Bay...