How he found the solution of the mystery of the ancient Mayan calendar, the oldest time-counting system in the world, was explained yesterday by Dr. H. J. Spinden of the Peabody Museum in an ...

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 ...

provides insight into the celestial knowledge of ancient China. Adorned with characters, they focus on the Tiangan Dizhi, an intricate astronomical calendar system from the Shang dynasty.