- I've never quite gathered why people use these at sea?
- Because when you travel back you take a few hundred tonnes of the surrounding matter with you, Dad said. Not too awkward if it's just water, but rather difficult on land. And on land you'd run a risk of materialising slap bang in the middle of a building or something.
- But isn't the planet in a different position anyway? I mean what with rotation and going round the sun and the sun itself, you know, going round the galaxy ...
Dad shrugged vaguely and looked away, as he did when irritated by pettifogging details.
Brightonian wrote:I know there's nothing new in SF but I haven't seen this issue addressed anywhere.
... one could travel with the space-time motion of the Earth not in a literal, but in a "virtual" way that would enable a time-traveller to remain with his base on Earth wherever he went in time. It would be useless for me to try to explain that mathematically if you have not had Temporalist training. Just accept the matter.
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