It didn't have to be placed off centre, it just happens that it is that way. It is possible that when the planets of the solar system first coalesced out of the cosmic dust that Earth's rotation was closer to that of the plane of it's orbit but due to collisions between bodies that occured in the early solar system it's rotation was knocked off-centre.
This model of the universe placed the Earth at the center of the universe
Earth
The Earth was at the centerback then....
He placed the Sun at the center of what is now called the Solar System instead of the Earth.
Ptolemy's view proposed a geocentric model where Earth was at the center of the universe, while Aristarchus suggested a heliocentric model with the Sun at the center and Earth revolving around it. This fundamental difference in perspective laid the groundwork for later advancements in understanding the solar system.
He placed the Sun at the center of what is now called the Solar System instead of the Earth.
If a simple pendulum is placed at the center of the Earth, it will experience zero net gravitational force because it is equidistant from all directions. As a result, the pendulum's motion would be unaffected and it would not swing back and forth due to the absence of a gravitational pull.
The weight of an object will be minimum at high point like mountain. This is because weight depends on acceleration due to gravity and acceleration due to gravity is inversely proportional to the square of distance from center of earth to the object. As high places like mountain is far from earth center, there is minimun weight. But at the center of earth the weight becomes null as gravity pull takes place in all direction from the center.
Lava is created/stored at the center of the earth. The center of the earth is very warm because the earth absorbs some( i believe 5%) of the heat give off by the sun.
Center out i think
The belief that Earth was the center of the universe was prominent in ancient times, especially during the Ptolemaic system in the 2nd century AD. This geocentric view was modified by Copernicus in the 16th century with his heliocentric model, which placed the Sun at the center of the universe.
He presented the first known model that placed the sun at the center of the known universe with the earth revolving around it. This was in the 3rd century.