33
/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
November 1, 2025
2233200
187180
2
Public Timelines
FAQ

jan 1, 1693 - New Equation

Description:

Edmond Halley provides a mathematical equation for finding the focal lengths of lenses of all shapes.

Added to timeline:

27 Nov 2018
0
0
156

Date:

jan 1, 1693
Now
~ 333 years ago