Spherical Earth is a solid fact despite the "objection" of an American singer

Before a traveler traveled around the universe before a long time, or someone went into space, the ancient Greeks discovered that the earth was spherical, not flat.
The famous American rapper Bobby Ray Simons, whose name is "BOB", is trying to convince his followers on Twitter that the earth is flat and not spherical.
How does the distance look like two points apart from 16 miles in a picture, so BOB, who wrote on his Twitter account, says, "Where is the curve? Please explain it."

A number of similar questions were raised in response to BOB's question.
Many people have tried to discuss it, rejecting what he says, including astronomer Neil Degrass Tyson. But it seems that BOB has not changed its mind.
i am usually do not give weight to the conspiracy theories, but i can not let this go that way.
On the one hand, my blog carries the word "earth" in its name, and on the other hand i think it involves a bit of humor in knowing how to discover such great theories about the universe.
Let's start with a number of pictures.The image is made up of a series of images taken by the NASA camera from one of its satellite satellites that monitor deep space.

None of the pictures were taken by BOB because it also claims that all the images taken by NASA are counterfeit.
You'll have your own point of view about the reasonableness of the next thing, but regardless of anything, think about it: we knew the earth was round for a long time before we mastered space travel.
More than 2,000 years ago, the Greek philosopher Aristotle thought about it.
In his book "In Heaven," Aristotle wrote: "Once again, our observations to the stars show that the earth is not only circular, but also a circle of not great size.Just a simple change of location to the south or north leads to a visible change of the horizon. "
In other words, you see different groups of stars in the night sky depending on where you are. The sky in the northern hemisphere is not what it looks like in the southern hemisphere. If the ground was flat, we could see the same stars at any given time, but we could not. There is also a Greek thinker and a scholar of mathematics, named Eratosthenes, who went even further and was able to measure the circumference of the planet. He discovered that in the afternoon in one of the Egyptian cities the sun was perpendicular directly above the heads, while in another city, the sun did not rise high yet. Eratosthenes knew the distance between the two cities, measured the height of the sun in the sky in each of them at the same time, and then used some methods of trigonometry. Although his approach was primitive, his answer was in place.The fact that the earth is circular has become a general knowledge, at least between the educated and powerful argumentants.
More recently, some people have embarked on trips around the globe, including Portuguese travelers Ferdinand Magellan, who traveled the globe from 1519 to 1522, on his famous journey that would have been more difficult if the earth was flat and edge at the end. Even before the appearance of Magellan for a long time, it was clear to seafarers who record their observations that the earth is spherical. If you set sail for something as long as a mountain, you would see the top of that mountain appear on the horizon before you could see the rest of the mountain.