Star trails.

In intro to painting class last year, at my old school in Chicago, i did a watercolor painting of what looked like a bunch of huge circley things in the sky. i wasn't sure what the image was of, i just thought it was beautiful so i printed it out to bring to class. i want to know if this phenomenon is real, and what it's called if it is. i think they're called star trails. i found a bunch of pictures so you know what i'm talking about.

Here's the one that i copied in my painting:i think these are gorgeous.






Comment if it would please you to help. Merci for reading.