Written records of the history of China date from as early as 1500 BC, from the Shang dynasty (c. 1600â1046 BC). Ancient historical texts such as the Records of the Grand Historian (c. 100 BC) and the Bamboo Annals (296 BC) describe a Xia dynasty (c. 2070â1600 BC) before the Shang, but no writing on a durable medium have survived.
A square is a quadrilateral so it has 360 degrees. A square is a quadrilateral so it has 360 degrees.
There are 360 degrees in a complete circle or sphere but in all longitude measurements, the total of the degrees is expressed as 2 halves of 180 degrees each, moving East and West from the prime meridian. East is positive and West is negative. Latitude is designated as North and South but in 90 degree sectors.