The One-Way Speed of Light
- Geraint Lewis
- Nov 1, 2020
- 1 min read
Updated: Dec 5, 2020
How fast does light travel? Well, you might say the speed of light, but physicists have only ever measured the two-way speed of light, where light heads out and bounces back. But we have never measured the one-way speed of light and it could be between half "the speed of light" and infinity.
This is not a new insight! Einstein realised it in 1905! So why do so few scientists and students know this?
This was a pleasant and informative read. I liked how you stayed focused on the main subject without adding unnecessary distractions. The explanations were straightforward, which makes the content accessible to many types of readers. It’s always good to see blogs that prioritize understanding over complexity.
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Somehow I do not want to agree with the conclusion. We can measure one way speed of light.
we need to redefine simultaneity. My proposition is as follows:
if a rigid body AB of length l is moving without any acceleration parallel to X axis and at time t0 its point A is at location x, then simultaneously its point B is at location x+l
Let's now design the experiment to synchronize distant clocks and measure one way speed of light:
Imagine four spaceship flying as a perfect square ABCD towards not moving (at least relative to each other) points EF parallel to AD and distance EF equals AD. Point E should be collinear with points AB and point F…