The direction of Earth's rotation axis, as well as its orbit of revolution around the Sun, are indeed evolving over time. The latest episode of "Cool Met Stuff" explains how these variations would affect the coming and going of ice ages on Earth. The video is now available on the "MyObservatory" mobile application and the Observatory's website for your viewing.
Observatory's "Cool Met Stuff" channel (broadcast in Cantonese):
Broadcast schedule of various TV channels: