MMX for Dummies

The result of the Michelson-Morley experiment is well known, but some people still do not understand the Principle of Relativity. The result is the same regardless of which direction the Earth is orbiting the sun, and is quite simply explained by the vector addition of velocities. 

To the "stationary" observer on the left the yellow path of the "tip of the ray" as Einstein calls it (which he/she never observes) is longer than the blue path seen by the observer on the right below, yet takes exactly the same time. 

To the "stationary" observer on the right the blue path of the "tip of the ray" as Einstein calls it (which he/she never observes) is longer than the yellow path, yet takes exactly the same time.   Why anyone would deny this simple observation can only be explained by stupidity. The illustrations are of exactly the same experiment but as seen by the two different observers. 

"Frustra fit per plura, quod fieri potest per pauciora."
It is vain to do with more what can be done with less. -- William of Ockham, circa 1288 - 1348

"We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances." -- Sir Isaac Newton, 1643 - 1727
 

Everything should be as psychotic as possible, but not simpler. --Albert Einstein 1879 - 1955

"But the ray moves relatively to the initial point of k, when measured in the stationary system, with the velocity c-v; it follows, further, that the velocity of light c cannot be altered by composition with a velocity less than that of light." --Albert Einstein 1905.

If things don't soon alter, they'll stay as they are.

Ecclesiastes 1:9

 What has been will be again, what has been done will be done again; there is nothing new under the sun.

Things are more like they are now than they've ever been before.