In the ancient world, astronomy was important for precise timekeeping, religious ceremonies, and agricultural management. The movement of the sun across the sky determined the seasons, while the lunar cycle of 28 days provided convenient divisions of the year—12 months, based on monath, the Old English word for moon. Chinese astrology and constellations were often used for divination. More than 3,000 years ago, Chinese people invented the 10 Heavenly Stems and 12 Earthly Branches for chronological purposes. These signs are used to designate the hours, days, months and years. However, since most people at that time were illiterate, the signs were difficult to use. Ancient Chinese Astronomy The first Chinese records of astronomy are from about 3000 BC, and they used the circumpolar stars as their reference point for the heavens, unlike the Indo-Europeans who used observations based upon the rising and setting of celestial bodies on the ecliptic and the horizon.
Pyruvic acid enters the fermentation cycle from glycolysis. Glycolysis is when glucose molecules are broken down to form pyruvic acid molecules and it produces 2 ATP.
