Time dilation in SF and GPS

I’m reading Voyage to Alpha Centauri and ran into a question about relativity. The book says in one place that their ship is moving a 56.7% of the speed of light, and in another place it says that time moves about 20% slower for them relative to folks on Earth. Are those two statements consistent? […] The post Time dilation in SF and GPS first appeared on John D. Cook....

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