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What is the name of the imaginary line around which the earth turns?
What is one complete spin of Earth on its axis called? How long does this take?
What is one complete trip around the sun called? How long does this take?
The imaginary line is called the axis.
One complete spin of the Earth on its axis is called rotation, and it takes 24 hours.
One complete trip around the sun is called revolution and takes 365 1/4 days.