Aristarchus, an ancient Greek astronomer, thought the sun was at the center. Centuries later Copernicus told his students that orbital trajectories were easier to calculate assuming the sun was the center. In 1610 Galileo observed Jupiter with a home made telescope, and his observations of it and Venus lead him to conclude the sun had to be the center of the solar system.
Ten years before Galileo's observations, Giordano Bruno was burned at the stake for his heresy of a heliocentric solar system. But of these folks, Galileo's astronomy was the cleanest, best argued, and had the most supporting evidence.
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Nicolaus Copernicus proposed the theory that the Sun is at the center of the solar system in his work "De revolutionibus orbium coelestium" (On the Revolutions of the Celestial Spheres) in the 16th century. This heliocentric model replaced the geocentric model, which had Earth at the center of the universe.
Nicolas Copernicus mainly, but other astronomers like Galileo did as well (even Leonardo da vinci did)
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The first person known to have suggested that the Sun was at the center of the solar system was the Greek astronomer and mathematician Aristarchus of Samos, about 2400 years ago.
The theory evolved over a while but the full theory of heliocentrism was put forward by Niccólo Copernico (or Nicolas Copernicus in English). However, Tycho Brahe put forward the idea of heliogeocentrism, this is the theory that the other planets are revolving sun that is revolving around the earth.
Everybody in the world until Nicholas Copernicus proved them wrong. However, Aristotle was the person who "Proved it", but was later found to be incorrect.
The common, popular answer is that Nikolaus Copernicus first put forward the heliocentric theory where the sun is the center of the solar system.
Aristarchus of Samos, a Greek astronomer who lived in 300BC, was probably the first person to state the heliocentric - "sun centered" model of the solar system.
The first astronomer on record as having said that the Earth revolves around the "central fire" was Aristarchus of Samos, a Greek astronomer and mathematician, about 2400 years ago.
The sun is at the centre of our solar system
Yes, our Sun is in the centre of our solar system.
The sun is in the middle of the Solar System.
In the middle
Nicolaus Copernicus!