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:
Philosophical Transactions Vol LXXVII Tab Page . en Foldout tab from Volume of Philosophical Transactions with six diagrams illustrating the position of comets observed by Caroline Herschel and William Herschel org Internet Archive copy of JSTOR version of Philosophical Transactions of the Royal Society William Herschel other