Wobbling path

Hey I was wondering if anyone could debug this?

It’s really simple… Just an earth ball going around the “sun” ball… with the tilted and 90 degree axis…
Its just wobbling a lot as it goes… I dunno why… i’ve never had this problem before… usually things are smooth.

I tried subdividing the path but that only turns it into a rounded square… needs to be a circle or ellipse.

It would just be great if it wouldn’t wobble… Thankx for any help.

earth.blend (2.0 MB)