NATS 1745 Lecture Notes - Lecture 6: Maya Calendar, Eclipse Cycle, The Moons

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September 21, 2011: el caracol: openings in the observatory dome are aligned. This is not based on any astronomical cycle. Mayan record describe this date as the last date of one calendar cycle, as opposed to the last date of all time. August 3100 bc mayans believe this to be their date of creation: mayan number symbols: visually represent their quantity, making them efficient for addition and subtraction of large numbers. Their longer-term, complex cycle led many to believe that eclipses are random. Their cycle is about 18 years, you"d need to observe them for this long to decipher the pattern. 1. lunation: one complete cycle of moon phases. (~29. 53 days). 2. as the moon orbits earth once a month, earth sees different portions of its sunlit side, causing the. Moon"s appearance to cycle from completely dark (new) to completely illuminated (full). Moon"s always lit on same side, seems to alternate when we view it from different places on earth.

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