Foucault pendulum and atmosphere

I'm a bit confused with how the foucault pendulum works.

EDIT for clarity:

The Foucault pendulum shows an effect which is commonly described as follows: the plane of oscillation of the pendulum seems to rotate from the perspective of the person observing, who is on the same frame of reference as the Earth, due to the Earth rotating beneath it. My question is, if the Earth, the atmosphere, the pendulum and me are all rotating with the Earth at the same rate, shouldn't we observe an oscillation on a plane which never rotates?

• Hello. Welcome to PSE. This question is vague. Yes, the atmosphere is rotating with the earth but I cannot understand what you are asking. Can you provide a diagram? What do you mean by "push the pendulum along?" Perhaps you could check the wiki article en.wikipedia.org/wiki/Foucault_pendulum to get a look at the mechanics of a Foucault pendulum. – joseph h Sep 3 '20 at 1:59
• Sorry for not expressing it clearly. What I meant was, why doesn't the plane of oscillation of the pendulum always rotate along with the Earth at the same rate? I don't get why we observe the plane of oscillation rotating from our frame of reference since me, the pendulum, the Earth and the atmosphere are rotating at the same rate, shouldn't I see the pendulum oscillating on a plane that never rotates? – Cromen Sep 3 '20 at 2:01