|South Celestial Pole Star Trail by Andrew Cool is licensed|
under a Creative Commons Attribution 4.0 International License.
Andrew says that there was a great amount of green airglow visible on the night he made the photos. The image was originally published by the Planetary Society.
*I was very grateful for Andrew's help in testing the app in the Southern Hemisphere. It turned out that the first version we gave him to test asked him to look for the stars that were currently up in the sky... over Germany! So Andrew was left staring at his boots instead of up into the sky.