Bill S., Bill6 is referring to section four of Einstein's 1905 paper on Special Relativity. At the end of section 4 Einstein concludes that a clock traveling on a curved path from point A and back to point A that the traveling clock will lose time with respect to a clock that remained at A.
Bill Gill
[Sorry about the delay in responding; I've been having problems logging in.]
Close - my reference was to his section 4 description of clock A (initially synchronous with clock B) moving in a straight path to clock B's location where it is found that A lags behind B. Same thing basically but no need for a curved path.
He suggests that a clock sitting on the equator of the Earth would run slower than one at one of the poles.
Basis of the Hafele-Keating experiment.
I wasn't aware of that myself, but when I looked up the paper it was right there.
Although never having attended one myself I suspect that section 4 may be glossed over - not taught - in physics class perhaps on the basis that it contradicts the reciprocality of sections 1 - 3.
