One of astronomy’s first tools to measure the flow of time, a sundial is simply a stick that casts a shadow on a face marked with units of time.
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EquatorialSundial
Download PDF (219 KB)One of astronomy’s first tools to measure the flow of time, a sundial is simply a stick that casts a shadow on a face marked with units of time.
EquatorialSundial
Download PDF (219 KB)