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Quote by: jack The only definition of day we know is a terrestrial day, one created by the Earth's rotation relative to the Sun. On other planets days have varying lengths based on their rotational period. There is no universal "day". So to say a day lasts a thousand years is nonsensical unless you can specify a condition where it takes 1000 years for a complete rotation. A day is a specific measure, not an ambiguous one, except in poetry. |
But before there was a sun or earth, how would you define a day? Is it still 24 hours?