Androcles wrote:
Crazy Einstein thinks the time to get from A to B is half the time
it takes to get from A to B and back to A again.

For light, so long as A and B are stationary with
respect to each other, this is true.

London to New York - 7 hours against the jet stream.
New York to London - 6 hours with the jet stream

Perhaps you aren't aware that AIRcraft (note
name) are affected by the JET STREAM (note name)
because they propel themselves through the AIR.
Thus, the motion of air will affect their ground
velocity, which is the vector sum of the aircraft's
motion relative to the air (called "airspeed" in the
US) and the velocity of the air relative to the ground.

Light speed is not affected by wind. Did you think it was?

2AB/(t'A-tA) = speed, so
(tau0+tau2) / 2 = tau1
(7+6)/2 = 7, right?

I don't recall Einstein discussing flight times of
jets in 1905. That would have been even more prescient
than his prediction of gravitational lensing later,
don't you think?

- Randy