Today Jay Hall is doing a project related to earth’s axis. This is an imaginary pole through the center of the earth. The earth spins around this pole and makes one complete turn known as a rotation each day. This is the reason we have seasons and day and night. Not to be confused though with earth’s revolution which is the ear making one revolution around the sun in one year.
Jay shows us how to make a sun dial. A sun dial uses the position of the sun to tell time. It was used up until the early 19th century.
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