How to pronounce “oscillate”(noun) in English

And that, the tilt of the Earth's axis -- which is today about 23 and a half degrees from the plane of our orbit about the sun -- that actually oscillates between 21 and 24 degrees.And the shape of the ellipse about the sun oscillates with a period about 100,000 years.And the procession of the equinoxes, which determines which hemisphere is getting more sunshine in June or December -- that has a period in the low 20,000 years.