Sutra 3.28 “Samyama on Polaris gives knowledge about the relative movements of the stars” Desikachar translation (3.29 Iyengar counting).

So by integrating and meditation on the Polar star the yogi will get knowledge of the movement of the stars. I have never tried this, I have no experience with this. But I can relate to Iyengars word by word translation;
dhruve – fixed, firm, permanent, the Pole star, era, tip of the nose
tat – from that, of their
gati – movement, course of events, fortune
jnanam – knowledge

To me this means by meditation on and integrating what's firm and fixed I get to know what's changing and moving.

I can relate to this! For example, in the asanas where I twist, when a part of the spin is fixated (upper back fixated by arms along the floor to the sides or lower back fixated by knees together...) I get to deepen my experience the part which actually moves. The sutra also brings to mind "looking at the sky" and how intense the clouds movements gets when there is a high building or a mountain to look at simultaneously.
The sutra gets turned over in me to every time I know something about the change and movement I know it from an integration of a fixed polar star in me. My position as an observer is that of firmness and steadiness.

In my teaching this becomes working the foundation (feet) working the focal points in balances and perhaps using floor and wall a bit more than usually.

Namasté

Jenni