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Portable cylinder - PowerPoint PPT Presentation

CALANDARS AND SUNDIALS:

CALANDARS AND SUNDIALS:. Astronomical basis of calendars . The principal astronomical cycles are the day (based on the rotation of the Earth on its axis), the year (based on the revolution of the Earth around the Sun), and the month (based on the revolution of the Moon around the Earth). .

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Portable cylinder - PowerPoint PPT Presentation

CALANDARS AND SUNDIALS: