March 12, 2018
Gravitational forces, Ladder in Barn Paradox, Twins' Paradox, speed of light, space-time diagrams, Einstein's train, Light-clock, simultaneity, reciprocity, time dilation, GPS, satellites
In physics, the Twin's Paradox is a thought experiment in special relativity, involving identical twins, one of whom makes a journey into space in a high- speed rocket, to return home to find that the twin who remained on Earth has reached a greater age.
Many explanations of this hypothesis have been offered since it was originally posited, (1911 Paul Langevin ) with almost as many rationalisations as there are physicists addressing the issue. As this conundrum relies upon the protagonists' impressions of events and how things appear to them, concerning the passage of time, I build a light-clock, diagnose reciprocity errors and offer new points of view and an unequivocal answer to the riddle.