Traditional Culture Encyclopedia - The 24 Solar Terms - What's the difference between the lunar calendar and the solar calendar?
What's the difference between the lunar calendar and the solar calendar?
In the lunar calendar, days are calculated according to the period of the moon. The moon goes around the earth once, that is, in January, with an average of 29.5 days per month. The solar calendar calculates the days according to the solar cycle. The period of the earth's orbit around the sun is 1 year, with an average of 365.2425 days per year, so a "leap day" needs to be added every 4. 1 3 years.
So 1 year (the earth revolves around 1 revolution) contains about 12.4 lunar months. Therefore, when using the lunar calendar, add leap months to make up for 1 year. There are two leap months every five years, and 1 year has at most 1 leap month.
In fact, due to the existence of leap month, it is not accurate to calculate solar terms according to the lunar calendar. The calculation method of solar calendar is closely related to the earth's orbit around the sun, which is more in line with climate and solar terms.
For example, spring equinox of 3.20-3.22, summer solstice of 6.2 1-6.22, autumn equinox of 9.22-9.24,12.21-kloc-0/2.23 winter solstice.
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