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.
Keywords from Image Description:
Kirchner Athanasius Selenic Shadowdial. The Selenic Shadowdial or the Process of the Lunation Illustration in Athanasius Kircher's book Ars magna lucis et vmbrae in decem libros digesta quibus admirandae lucis et vmbrae in mundo atque ade vniuersa natura vires effectusque vti noua ita varia nouorum reconditiorumque speciminum exhibitione