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Einstein who's General Theory of Relativity and Principle of Equivalence (see links below), suggests that curved space/time, defines the universe as geodesic and may have no actual center. So Earth, like everything else in our universe, exists on its geodesic plane and not at its center.
The death of the theory of an Earth-centered universe began when Copernicus first suggested that Earth was not even the center of our solar system. Though this idea was not well received at the time, it was later confirmed by the classic observations and calculations of Galileo
The answer of Albert Einstein fails to account for the fact that the center of the universe question was answered well before Einstein was born.
Earth
He believed in Heliocentrism (That the sun was the centre of the universe, not Earth).
Ptolemy's model placing the Earth at the center of the universe was developed in the 2nd century AD. It was part of his work on astronomy known as the Ptolemaic system, which was widely accepted until Copernicus proposed the heliocentric model in the 16th century.
Galileo Galilei
Aristotle believed that the center of the earth was composed of the element earth, surrounded by water, then air, and finally fire. This concept was part of his theory of the four elements, which he believed made up all matter in the universe.
According to Aristotle the Universe is a sphere and Earth is at the centre.
Copernicus suggested a heliocentric model of the universe. Meaning, the earth was the centre of the universe and other planets had to orbit around the earth. This model of the universe was against Ptolemy's model of a geocentric model; a stationary Earth at the centre of the universe.
Earth
The geocentric modelof the universe stated that the earth was at the centre of the universe.
Nicolaus Copernicus was polish He was astronomer and mathematician who discovered that the earth was not the centre of the universe, but rather the sun was I think that makes him pretty important
he Earth-centered Universe was proposed by Aristotle and Ptolemy.
The Earth was considered the centre of the Solar System and the Universe.
They believed that the Earth was the centre of the universe even after Galileo presented his idea. It was later proven that the sun was the centre of the universe.
Copernicus was an astronaut and Mathematician, it is during the research that he was able to get the principle idea that the earth was not at the center of the universe.
cupercunicus- Actually it was Galileo
The first scientist to say the earth is not the centre of the whole universe was Nicolaus Copernicus early in the sixteenth century.
Brahe's theories revolved around the ptolemaic system, where Earth was the centre of the Universe. Copernicus stated that the Earth is not the center of the Universe, but we revolve around other masses as well.