Question

Who thought the earth was the center of the universe?

Answer 1

Hint : You're aware that the Earth revolves around the Sun since you've been taught so. You're presumably also aware that planets other than our own have moons, and that the best method to determine whether something is true is to test it. These facts were not generally recognised thousands of years ago. The skies above were a mystery, and things were as they were because the gods had designed them to be. It was decided that there was no need to fully comprehend them or arrange them in any way.

Complete Step By Step Answer:
Ptolemy was a mathematician and astronomer. The Earth, he felt, was the centre of the Universe. Because the Greek word for earth is geo, we name this hypothesis "geocentric." Even with this erroneous hypothesis, he was able to forecast the motions of the planets by combining what he saw of the stars' movements with mathematics, particularly geometry. The Almagest was his most renowned masterpiece. He calculated that the planets must travel in epicycles, smaller circles, and the Earth itself must move along an equant in order for his forecasts to be correct. None of this was true, but it allowed him to make his predictions based on the arithmetic. For millennia, this erroneous picture of the universe was accepted.
Ptolemy argued that the Earth was a sphere in the centre of the universe based on the simple observation that half the stars were above the horizon and half were below the horizon at any given time (stars on rotating stellar sphere) and the assumption that the stars were all at some modest distance from the universe's centre. This divide into visible and invisible stars would not be equal if the Earth were far moved from the centre.

Note :
The Geography (also known as the Geographia) is Ptolemy's second major work, a compilation of geographical coordinates for the parts of the world known to the Roman Empire at the time. He drew on the work of an earlier geographer, Marinos of Tyre, as well as Roman and old Persian Empire gazetteers. He also credited Hipparchus, an ancient astronomer, with assisting in the elevation of the north celestial pole for a few towns.