Chinese calendar
Four-quarters calendar

Another version is a four-quarters calendar (四時八節曆; 四时八节历; ' four sections ', ' eight seasons calendar ', or 四分曆; 四分历). The weeks were ten days long, with one month consisting of three weeks. A year had 12 months, with a ten-day week intercalated in summer as needed to keep up with the tropical year. The 10 Heavenly Stems and 12 Earthly Branches were used to mark days.
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