The movement of the sun over 30 minutes is subtle but noticeable. Here's how you could describe it:

Simple Description:

* The sun will appear to shift slightly in the sky, moving a small distance across the horizon.

More Descriptive:

* Over the course of 30 minutes, the sun will slowly inch its way across the sky, its path determined by its position in the day and the time of year. You might notice its rays shift slightly, casting shadows that lengthen or shorten depending on the direction of its movement.

* If the sun is close to the horizon (during sunrise or sunset), the movement will appear more pronounced as it dips below or rises above the skyline.

* If the sun is high in the sky, the movement will be more subtle, but you might still be able to observe its gradual progression across the heavens.

Remember:

The sun's apparent movement is an illusion caused by the Earth's rotation. The sun itself doesn't actually move across the sky, but we perceive it as doing so because our planet is spinning.