Artist: Joe Satriani
Original Album: Time Machine
Track: Speed of Light
Einstein's two axioms for special relativity:
- The laws of physics are identical in all inertial frames
- There exists an inertial frame in which light signals in vacuum always travel rectilinearly at constant speed c*, in all directions, independently of the motion of the source.
* c is 2.9979245...x 10^8 m/s, that's roughly 300,000,000 metres per second.
Between the two of these axioms we are given Einstein's law of light propagation:
-Light signals in vacuum are propagated rectilinearly, with the same speed c, at all times, in all directions, in all inertial frames.
This essentially means that if you are standing still (in relation to the inertial frame of the planet Earth), light travels away from you and towards you and in every direction at the same speed. However…