Re: Simple question

On Oct 30, 12:15 pm, PD <TheDraperFam...@xxxxxxxxx> wrote:
On Oct 30, 11:44 am, kenseto <kens...@xxxxxxxxxx> wrote:





On Oct 29, 6:14 pm, "Martin Hogbin" <goatREMOVETHIS...@xxxxxxxxxx>
wrote:

"Ali" <akous...@xxxxxxxxxx> wrote in messagenews:1193693371.813714.205500@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
It appears to me that the time for any other frame of reference can be
slowed down but not speeded up. That is true wether the other frame of
reference is moving relative to ours or is in a gravitational field. I
wonder if some one can kindly explain the following puzzle for me.

Suppose that you are traveling in a space craft looking at you twin
sister on earth. For both of you time for the other one is running
slower. You see your sister staying younger than you and she sees you
staying younger.

'See' is not a good word to use, you will measure
your sister to be aging more slowly.

Measure is not a good word to use.

On the contrary, measuring IS the right word to use. Seto doesn't
understand the difference between prediction and measurement. I'm not
sure if he's measured anything in his life.

You use an equation to make prediction. That is not a measurement.

.

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