RBF Definitions
"I have a railroad train going west through the desert and a man leans out the window and drops a flaming apple. He sees it go East. He has a sextant and a stopwatch with him and measures the angle and the amount of time, and so forth. But he sees that he himself is standing still. He is like all of the people standing on the surface of the Earth not realizing that the Earth is going around the Sun at 60,000 miles per hour. And so for him the apple seems to go in an easterly direction.
"Another man standing at a great distance simply sees the apple descend toward the Earth.
"Then a man standing very much to the north sees the apple go west-- with the motion of the train.
“All these different observers then come out with different results concerning the same experiment.”
