– How do we actually know when the earth does a full orbit of the sun and why are our years based off of it?

Question

– How do we actually know when the earth does a full orbit of the sun and why are our years based off of it?

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Answer 1

From a fixed vantage point the sun rises in a slightly different point on the horizon in the east every day moving a little north or south until the summer and winter soltices where it begins traveling back the other direction. It takes roughly 365 days for one complete cycle.