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Apr3-08, 05:53 AM
P: 2,043
Quote Quote by JesseM View Post
Sure, just analyze the situation from the point of view of an inertial frame where the accelerating twin's speed during the inertial phase between leaving Earth and turning around is smaller than the Earth's speed in this frame. Naturally if the Earth's speed is greater during this interval, its clock is ticking slower during this interval.
Perhaps I misunderstand you but, if we have:

1. Twin A and B on planet P and point X, a fixed distance away from planet P.
2. A accelerates away from P towards X.
3. A accelerates towards P to stop at X.
4. A records the total elapsed time since 2.
5. A accelerates away from X towards P.
6. A accelerates towards X to stop at P.
7. A records the total elapsed time since 5.

Then all observers must agree on both recorded proper times recorded in step 4 and 7.