Not editable
http://www.slides.uni-trier.de/
https://php.math.unifi.it/archimede/archimede/curve/guida/paginaindice.php?id=2
https://en.wikipedia.org/wiki/Pope_Clement_IX
https://it.wikipedia.org/wiki/Giacomo_Rospigliosi
https://en.wikipedia.org/wiki/Magic_lantern
http://www.astronomicalimages.group.cam.ac.uk/database/entry.php?entry_id=793