The setting time will be several seconds later with the added height. If Earth were flat, the sun would be visible at all elevations at the same time. Watch as the sun sets from the ground floor, and once it sets just below the ocean, communicate over your cell phones and measure the time difference the added elevation adds to the ground-based setting time. From the building, have a friend observe the sunset from the fourth floor, or higher. Pick a tall building from which you have a clear ocean horizon in front of you. You can also detect the curvature of the Earth by observing a western sunset over the ocean. Just to be sure, however, bring a pair of binoculars with you so that you can see details even farther off into the distance. And you can always observe this yourself by visiting a harbor or any place with a wide-open view of the ocean. This phenomenon can only be explained by a sphere-shaped Earth. It’s as if you’re watching it go over to the other side of a hill. The ship sailed beyond the point at which you would see it. However, from antiquity, early sailors noticed when they observed a ship sail off to sea, as they watched its mast and flag, it did not fade off into the distance, but rather the ships mast and flag appeared to slowly sink into the sea. After all, no matter the scientific evidence and videos from space, if you put a level on the ground it appears flat, and if you look around the horizon, there appears to be no curvature. Without going out into space, it is impossible to observe the actual sphere of the Earth directly. Surprisingly, one example is the so-called flat Earth hypothesis, which has experienced resurgence in popularity with internet-trolls recently, even though it has been scientifically disproved for several thousand years. However, by its very nature the internet can also include false information about what anyone wishes to publish, and pseudoscience is often promulgated as being science fact. The internet is a great way to get facts on just about any subject.
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