What did Copernicus discover about the rotation of the Earth? The Earth's orbit wobbles as it revolves around the sun. The Earth wobbles as it rotates around its axis.

He actually discovered that the earth's orbit of both day/night cycles and revolutions of the sun were not uniform thus causing inconsistencies in the calendar's fate

Nicolaus Copernicus was best known for developing the heliocentric theory: he discovered that the Earth revolved around the Sun and not the other way around.

The Sun was the center of the axis of the other planets which were those that revolved around it.

The answer is: Earth's orbit wobbles as it revolves around the sun.