The Firmament with Stars
The night sky is a solid and transparent layer dividing the heavens 7 and 8. Stars are lights in the firmament projected by the Celestial Sphere or The Stars of God. However, the Celestial Sphere is staionary and the stars don't move on their own, the other thing is that the light from the Celestial Sphere covers only half of the firmament - to make the lights in the firmament from east to west, and to stretch them over the entire firmament is the job of The Leaders of the Stars. All stars move from east to west in a straight line at the same speed, including Polaris.
As the stars move from east to west in a straight line, their light bodies are being bent by the foundation of Heaven - stars south of the equator visually encircle the southern celestial pole, stars north of the equator visually encircle the northern celestial pole.
Picture above: The light body of the star is deflected to the northern Foundation. Correspondingly, the star appears to be encircling the northern celestial pole.
Last picture: The star runs right above the terrestrial equator. Its light body is "equalized" between the two Foundation. Accordingly, its path appears linear from any point within its light body - exactly what we observe in the sky. The celestial equator appears as a fixed and straight line from any point on Earth. Reminder: On a rotating round Earth, the celestial equator would be perspective, not geographic, and it would vary from latitude to latitude.