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- TL;DR Summary
- Earth's orbit not perfect ellipse from the classical, relativistic, and quantum mechanical point of view

Listen to the following arguments:

- Earth's orbit isn't perfect ellipse because classically there is the gravitational field of moon and possibly of Mars and Venus which affect it
- According to general relativity isn't perfect ellipse because there is the curvature of space time which doesn't work exactly classically like Newtonian gravity and there are also gravitational waves which may affect its orbit
- According to quantum mechanics, Earth is a big set of quantum mechanical particles which don't have definite orbits, therefore Earth doesn't have a definite elliptic orbit