Comment

Yes, but it’s part of the definition of a light-year, i.e. the distance light travels in a vacuum within one Julian calendar year. Using a year as reference to the distance light travels within a given timeframe is fairly arbitrary. We could just as well use light-months, or light-decades, or some entirely different time as reference.

source

Sort:hotnew top

Cethin@lemmy.zip ⁨19⁩ ⁨hours⁩ ago
On addition, we could measure year by a different planet. To the universe, choosing the time it takes the Earth to move around the sun one time is pretty arbitrary. Why not Mars? Or why not a totally different star system?

source
null@piefed.nullspace.lol ⁨17⁩ ⁨hours⁩ ago
Speed = Distance over time.

There are no measurements of speed that won’t face that problem.

source