Chinese Calendar

The Chinese calendar is a lunisolar calenday, which is based on the tropical year and the synodic month.

The primary cycle in the Chinese calendar is the Chinese month, which is closely synchronized to the synodic month. Since the synodic month has an average of about 29.5305888531 days, the number of days in a Chinese month varies between 29 days and 30 days from month to month.

The first day of a Chinese month must be the new moon day, when the moon is completely dark, that is the moon is in conjunction with the sun.

The secondary cycle in the Chinese calendar is the solar term system, which is closely synchronized to the tropical year. The solar term system has 12 principal terms to indicate the sun's longitudes at every 30 degrees, with the first principle term defined as the day when the sun's longitude at 330 degrees.

In addition to the 12 principal terms, 12 sectional terms are added to break the sun's longitude into 24 15-degree segments.

More...



Copyright © 2015 Dr. Herong Yang. All rights reserved.