guy incognito
Well-Known Member
Yes, because you are measuring the speed of light, not the speed of the earth, moon, galaxy, or any other material object. Light travels independently of objects. Light travel time is distance, they are inseparable when speaking about the distance and time of light travel.
But somehow if you are inside a box you don't measure the speed of light to be c? I don't understand how my lab is any different from the hypothetical box in your diagram. My lab is flying through space with a million different directional velocities, yet I turn my laser on and point it to the front of the lab and I measure the speed of light to be c, then I point it to the back and my measurement is the same. And it is the same no matter which way I point it, or what speed and/or direction my lab is traveling through space.