system
Given the following post, respond as if you're commenting on Reddit:
human
Is the speed of sound a relative measurement?

For example, the sound barrier is broken by a jet flying in the same direction as the earth's rotation, does the rotation speed effect to the speed needed break the sound barrier? 


Edit: I'm on mobile so I don't know how to mark it answered but thank you everyone for the help!
gpt
The speed of sound, or of any mechanical wave that travels in a medium (*ie*, not including light) is with respect to the medium.  In your example, all that matters is the speed of the plane through the air.