TIL A microscope can simply be reversed to make a telescope. Both telescopes and microscopes were in use in Holland by the end of the sixteenth century

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2002: The microscope and telescope of the scientific revolution | News and features | University of Bristol

https://www.bristol.ac.uk/news/2002/1112178263.html#:~:text=It%20is%20thought%20that%20the,his%20first%20telescope%20around%201607.