Editing 1665 in science (section)

==Astronomy==
* [[Giovanni Domenico Cassini|Giovanni Cassini]] discovered [[Jupiter]]'s [[Great Red Spot|red spot]] was a permanent feature and used this to measure Jupiter's period of rotation as 9 hours 56 minutes.<ref>{{cite book |last=Hockey |first=Thomas |date=1998 |title=Galileo's Planet: Observing Jupiter Before Photography |url=https://books.google.com/books?id=FhstfdOsgwoC |publisher=CRC Press |page=26 |isbn=978-0750304481 |quote=Cassini's sighting of a 'permanent spot' in 1665 was the more important observation because the regular recurring passage across the jovian disc of this easily observed feature not only offered proof of Jupiter's rotation but allowed Cassini to calculate the first reliable rotation time for the planet: 9h 56min}}</ref>