THE calendar of the ancient Egyptians was one of the earliest experiments in calendar making, and it was one of the most enduring. It was still in use at the beginning of the Christian era much as ...

According to Live Science, the discovery sheds new light on the ancient Egyptian celebration of Wepet Renpet, or the Opening of the Year, a festival that was central to their culture and calendar.

The Chinese Agricultural Calendar uses lunar months to determine its dates, but it also has “solar terms” which are based on the solar year. These solar terms helped the ancient Chinese people ...