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.
Kepler Mars retrograde. Johannes Kepler's depiction of the geocentric motions of Mars from Astronomia Nova source mlahanas de htm PDold low quality Orbit of Mars Johannes Kepler Geocentric coordinate system Round diagrams
Page 2023 Free-images.com. All images are Public Domain