Heavenly Mathematics & Cultural Astronomy, Tutorial 3

  1. What are the definitions of solar, lunar, and lunisolar calendars? Give an example of each.
  2. What is the leap year rule in the Gregorian calendar?
  3. Why did Britain skip 11 days in 1752?
  4. Why do we add the leap day after February 28?
  5. Explain how the moment of the March equinox moves in the Gregorian calendar.
  6. How often will Hari Raya Puasa and Chinese New Year coincide?
  7. Why will your Chinese and Western birthdays usually coincide on your 19th birthday?

Helmer Aslaksen
Department of Mathematics
National University of Singapore

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