rotation of a star造句

The rotation of a star produces an equatorial bulge due to centrifugal force.
This method analyses the brightness variation caused by the rotation of a star as its shape tidally distorted by the planet.
I'm no astrophysicist ( obviously ), but it seems to me that even if on average the axis of rotation of a star tends to aligned with the axis of rotation of the planets around it, being seven degrees or so off doesn't seem particularly implausible-at least without data to the contrary.
It's difficult to find rotation of a star in a sentence. 用rotation of a star造句挺难的