When is Chinese New Year? - Department of Mathematics

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$17. C. T. Chong and Liang Yu, A$\Pi^1_1$ uniformization principle ...$

There are therefore two different years in the Chinese calendar, the suì (d
If there is a new Moon on the day after the December solstice or within about 11 days, the suì is a leap suì. If there is a new Moon on the same day as the December solstice or the first new Moon after the December solstice is more than about 12 days later, it is a normal year. Notice that the leap year test applies to suì’s and not to nián’s. Because of Kepler’s Second Law, the speed of the (apparent) motion of the Sun across the ecliptic is not constant, so the time between the zhōng qì’s is not constant. This was known to Chinese astronomers since the 7th century, but it was not until the last calendar reform in 1645 that they started using the true Sun, dìng qì (d
Page 1 and 2: 1 Introduction When is Chinese New
Page 3 and 4: J1 Lì chūn d
Page 5: New Moon Next new Moon Length May 1
Page 9 and 10: Since the December solstice falls i
Page 11: un by other Westerners until 1826.

When is Chinese New Year? - Department of Mathematics

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