1500 years ago, people generally believed that the earth was flat and rectangular. However, as early as the 6th century BC Greek philosopher Pythagoras theorized that the Earth must be a sphere and in the 3rd century BC the Greek mathematician and astronomer Eratosthenes had deduced that the earth was round and computed its circumference. Oddly enough, peoples further back in time had greater scientific knowledge than the European nations of Byzantine and Medieval times. Until the second part of the 19th century, scholars in Europe thought that the Earth was just a few thousand years old. Yet ancient Brahmin books estimated the Day of Brahma, the lifespan of our universe, to be 4,320 million years – not very far off from modern calculations. Modern science emerged from the medieval darkness during the renaissance. By studying classical sources humanity re-discovered old truths that had been known by the Babylonians, Ionians, Egyptians, Hindus, or Greeks for many centuries.
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