Because it wasn't observable by eyes.
What's not immediately observable can be calculated. Don't forget that an Alexandrian librarian managed to accurately calculate the circumference of the earth without ever leaving the city in his life.
Another such librarian managed to figure out that the Earth, and all the planets, circled the sun, in a time when the common wisdom was that the Earth was the center of the universe.
The word "librarian" doesn't adequately explain what these people were. These people were the kinds of people the geekiest of geeks wish they could be. Arch-Geeks, if you will.
No, it's calculation.So it will be only a guess work,but i don't believe on such a lucky guess
Neither does anyone else.as i don't believe on random mutation that caused our ancestors of monkeys to evolve to humans.
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