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:
Kraus slunce . cs Zznam slunench skvrn ze dne ledna Lidov hvzdrna Pardubice Zznamy jsou archivovny astropardubice cz Hvzdrn barona Artura Krause Pardubicch en Record of sunspots January Lidov hvzdrna Pardubice Original records are kept in archive of astropardubice cz Artur Kraus observatory in Pardubice astro cz Artur