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:
Percival Lowell observing Venus from the Lowell Observatory in . Assessments Percival Lowell observing Venus Percival Lowell observing Venus in the daytime from the observer's chair of the inch cm Alvan Clark Sons refracting telescope installed in the summer of at the Lowell Observatory which he established in Flagstaff Arizona