* Earth: Earth is an oblate spheroid, meaning it's a sphere that is slightly flattened at the poles and bulging at the equator.

* Sun: The Sun is a sphere, though it's not perfectly round. It's slightly flattened due to its rapid rotation.

* Moon: The Moon is also an oblate spheroid, similar to Earth, but with a much smaller difference between its equatorial and polar diameters.

So, while all three are roughly spherical, they're not perfectly round!