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Probably the most important difference is the fact that 'light-year' is a unit of distance, whereas orbital 'period' is a unit of time.

One light-year is defined as the distance that light ... or electromagnetic radiation of any wavelength ... covers in one year of propagation through vacuum, equal to roughly 5,878,700,000,000 miles.

The orbital period of earth, or the time that elapses during one complete revolution of the earth around the sun, is roughly 365.25 days, a duration commonly referred to as the 'year'.

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Q: What is the difference between a light-year and the orbital period of Earth?
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