Star trails and stellar motion

Moon asked about my star trail photo from Sinai: "Is it for real? Or it is a camera manipulation?" Here's the basic explanation, from a page about charting the celestial sphere:

"The celestial sphere has a north and south celestial pole, as well as a celestial equator, which are projected from reference points from the Earth's surface. Since the Earth turns on its axis once every 24 hours, the stars trace arcs through the sky parallel to the celestial equator. The appearance of this motion will vary depending on where you are located on the Earth's surface."