Starship Asterisk*

So, in what sort of reference frame would light in vacuum have a different speed? The statement I made isn't restricted to Special Relativity. I refer to measurements done under non-zero and variable accelerations. Is the speed of light in vacuum different measured in a lab on Earth? Light will foll...

I have been in a discussion on another site and would like some expert advice: either I need to be straightened out or I would like to be able to defend the statements I've made. I have been insisting that, for all observers, the speed of light in a vacuum is a constant. Here's the statement I've ma...