Today gets 3 images since I went way up into the mountains by my house and did some star trails while camping. I love doing these because it's the only way I've even been able to comprehend the Earth's rotation. Of course there's the sun's movement, but something about setting a camera on the Earth next to you and then seeing how far the stars have moved is so tangible.
The first image was a 10 min exposure, the third is our campsite with the campfire behind a tree lighting up the whole grove. I love how the trails curve, drawing the curvature of our world. Next time I want to do some longer ones, an hour would be awesome.