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Originally Posted by Eta C
2) We can consider the Earth as an inertial reference frame for the purposes of the experiment. As Sean pointed out in an earlier post, we can place the experiment in deep space and have the stationary (or inertial) twin sit in a non-moving spacecraft.
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Non moving relaive to what?
Einstein said in his 1905 paper, “...the view here to be developed will not require an “absolutely stationary space” provided with special properties...”
You can’t have an absolutely "stationary" spacecraft in space.
And both “twins” in his SR theory are “inertial”. Neither feels any acceleration at all.