Prehistory. 1  Chang, Kwang-chih. 2  Discovery of residue from fermented beverage consumed up to 9,000 years ago in Jiahu, Henan Province, China. 3  Zhu, Rixiang; Zhisheng An; Richard Potts; Kenneth A. Hoffman. 4  The Discovery of Early Pottery in China by Zhang Chi, Department of Archaeology, Peking University, China.
There are a couple of popular ways of specifying the location of a celestial object. The first is what you would probably use to point out a star to your friend: the altitude-azimuth system. The altitude of a star is how many degrees above the horizon it is (anywhere from 0 to 90 degrees). The azimuth of a star is how many degrees along the horizon it is and corresponds to the compass direction. Azimuth starts from exactly North = 0 degrees azimuth and increases clockwise: exactly East = 90 degrees, exactly South = 180 degrees, exactly West = 270 degrees, and exactly North = 360 degrees = 0 degrees.
Since the Earth's axis is tilted 23.5 degrees, then on this particular day, the Sun's rays are striking the Earth directly at a latitude approximately 23.5 degrees north of the equator (that is, the Sun's rays are coming in at an angle of 90 degrees here; this is the subsolar point). View answerHide answer. 2  The Sun at noon would be 23.5 degrees above the horizon. 3  The Sun's altitude at 23.5 degrees north is 90 degrees (directly overhead). 4  The difference in latitude between the subsolar point (23.5 degrees north) and the North Pole (90 degrees north) is 66.5, and 90-66.5=23.5.