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 ...
An illustration of the Blue Ghost mission on the surface of the Moon. Firefly Aerospace The Moon is the place to be right now. Commercial spacecraft are gearing up to land on the lunar surface ...
Lunar eclipses were very important to the ancient Celts. In their book “Timeless ... is the evidence to be found in the Celtic calendar. The earliest-known Celtic calendar is the Coligny ...
That “more or less” requires leap seconds as well as leap years. Ancient civilizations didn’t need to deal with leap seconds. About 5,000 years ago, Sumerians invented the lunar calendar, unrelated to ...
Thanks to the regular repetition of these moments, since ancient times, the lunar phases have been the basis of the lunisolar calendar. However, it was difficult to establish the exact moment of ...