This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Universitaetssternwarte Wien . Universittssternwarte Wien Zeichnung von Vienna University Observatory drawing from Image provided by Prof Franz Kerschbaum Institut fr Astronomie Universitt Wien Author PDold Vienna University Observatory Historical images of Whring
Page 2023 Free-images.com. All images are Public Domain