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:
Stroobant star maps Venus satellite. en Three examples of Stroobant star maps which show stars that earlier astronomers may have mistaken for the satellite of Venus Stroobant Paul Le satellite nigmatique de Vnus Astronomie reproduced in Kragh The Moon that Wasn't The Saga of Venus' Spurious Satellite Birkhuser Stroobant Paul