My wife and I were digesting the time program a little tonight and we were puzzled by something on the show. Brian at one point was talking about time speeding up as something travelled. To explain this he used a test carried out with an atomic clock that was put on a plane that went around the world. There was a clock based on the ground where the plane took off.
Upon landing at the airport the atomic clock in the plane was a few hundredths of a sec forward in time.
But this is where it gets tricky. Later on he also says that time slows down with the greater the gravity. Ie someone in tall building will have time running faster than someone living on the ground as the person on the ground is affected more by gravity.
So what's up here?
Is it that time is speeding up with the travel or because the plane is further away from earth and thus affected slightly less by gravity?
Splitting hairs I know or thousands of a second but it is still puzzling me.
