The Romans added January and February to the calendar but ran into a problem — math and superstition. Here's why February became the odd month out.

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.

Feb. 29 is more than just an extra day we have once every four years. There is some science behind it. Here's how leap days ...

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.

We’re way ahead of anyone in Britain. Ancient Egyptian: What have you got in this linen sack thing anyway? Oh, a calendar! Now that is useful. It’s similar to our own solar calendar which has ...