Hey all, first I just want to say that I am by no means a physicist - just someone that is very interested in physics, and I have very little understanding of physics, but I am trying to learn. I've been reading this article about anisotropic synchrony convention which mentions that we cannot measure the one-way speed of light because you would need 2 perfectly synchronized clocks, and to synchronize them perfectly you would already need to know the one-way speed of light first. So this leads me to my 2-part question: 1. If you somehow made the light travel in a circle so that it travels back to you without going 2 ways, would you be able to calculate the one-way speed of light? 2. Is it possible to make light travel in a circle without affecting its speed, or at least affecting it in such a way where you would know exactly how much you affected it? Thank you in advance, I'm very curious about this.