The conversation between human and AI assistant.
What is a consecutive calendar day and how is it related with the Qin calendar?
Why was a 360-day year used in the Qin calendar?
It is believed that the 360-day year was used in the Qin calendar because it was a convenient number to work with mathematically, and because it corresponds roughly to the number of days in a year that can be counted between the winter solstice and the summer solstice.