The origin of the lunar calendar and the solar calendar?

The origin of lunar calendar and solar calendar

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The solar calendar is based on the sun. It takes the revolution of the earth around the sun as the unit to calculate time, that is, a "tropic year", that is, 365 days, 5 hours, 48 minutes and 46 seconds. For the convenience of use, 365 will be used for one year, that is, one year in the solar calendar.

The lunar calendar comes from the moon. Taking the cycle of the moon as the unit of calculating time, that is, the month of the lunar calendar is 29.5306 days, so it is stipulated that there are 30 days in the big month and 29 days in the small month, so the lunar year is 354 days. This is what we call the lunar calendar.

Upload date: 2006-11-2321:42:14.