Objects beyond the horizon
Both flat earthers and round earthers agree on the circumference of the earth, approximately 25,000 miles.
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If those 25000 miles form a ball, as we see in the NASA photos, then there must be a fixed rate at which it curves.
That rate of curvature is 8 inches per mile squared. This means that after the first mile it drops by 8 inches, the second 32, the third 6 feet, all the way down to 1.8 miles of a drop after 120 miles distance.
If the earth is a ball, then after a certain point looking straight out over the horizon, objects should start to disappear the further they go away.
In fact, we can calculate exactly when they should be beyond visibility, with various "earth curve calculators" available online, provided by people who have nothing to do with the flat earth.
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The problem for globe earthers is that there are consistently objects visible that should not be visible. Historically, we have many examples of this, but closer to our day, with advances in widely available camera technology, people can see for themselves examples of this.
Here below we show snapshots of one of the best produced videos showing islands off the coast of California.
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The photo is taken from over 30 miles away. With height of the camera there should be over 580 feet below the horizon.
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The small islands should be completely gone and most of the large one, yet this is not what we see.
We'll let the video makers speak for themselves...
Note also how steady and integral the picture is. This is important against those who try to claim that it is a mirage, or some kind of refraction.
If not upside down, a refracted image would not present itself with the same integrity and steadiness. The video shows this even better. (included below)
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There are many more examples of this. You are encouraged to go to this link
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