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If the length of the Earth's year was shorter in the past, why do we use the current Earth year length as a guide to describe the age of things in space, e.g. the Universe?

1499 upvotes • r/askscience

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Title	Upvotes	Subreddit	Mark as read	Favorited	Rating	Add to a list
If the length of the Earth's year was shorter in the past, why do we use the current Earth year length as a guide to describe the age of things in space, e.g. the Universe?	1499	askscience