February 1, 2022 is Chinese New Year or Spring Festival. Calculating Spring Festival each year is quite involved. The easiest answer is that it is the second full moon after the Winter Solstice. However, this is somewhat complicated by the fact that it should also be the new moon closest to the beginning of spring.

Today ushers in the Year of the Tiger. We are all familiar with the 12 Chinese zodiac signs, but there is another layer to the system. There are 10 celestial stems that complement the 12 terrestrial branches.

However only odd-numbered stems are paired with odd-numbered branches, and even-numbered stems with even-numbered branches. Henceforth, instead of 120 combinations, we get 60.

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