Rømer's determination of the speed of light - Wikipedia
Properties of Light
Introduction
Is it true that the speed of light has always been measured accurately using a two-way measurement (including a 180 degree reflection) only, because it is impossible to measure it one-way, due
Who first measured the speed of light? What method was used? | Astronomy.com
Roemer's Hypothesis
speed of light
Module 5: Page 2
How Did Ole Roemer Calculate The Speed Of Light Using A Moon Of Jupiter?
Ole Rømer's determination of the speed of light celebrated with Google Doodle | WIRED UK
Determination of the Speed of Light - Stock Image - C033/4488 - Science Photo Library
File:Roemer-Jupiter moons-Speed of light.svg - Wikimedia Commons
Rømer's determination of the speed of light - Wikipedia