You don't."Year" is a period of time, equal to the time the Earth takes to revolve once in itsorbit around the sun, corresponding to roughly 365 days."Light-year" is a distance, equal to the distance...
Divide by 1,000 . 3,120 lightyears = 3.12 kilo-lightyears
A light-year is about 63,241.1 astronomical units. You can multiply by that value (or some approximation, like 63,000 AU).
That is an incorrect conversion. Light years is a measure of distance, not time.
Divide the number of miles by 5.86 trillion to get light years.
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