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.
Thorvald Khl. en Thorvald Heinrich Johan Khl Danish educator and astronomer Royal Library Copenhagen author circa AnonymousEU Thorvald Khl Files from The Portrait Collection of the Danish Royal Library PDold
Page 2023 Free-images.com. All images are Public Domain