The Sumerians are thought to have formed the first human civilization in world history. They lived in southern Mesopotamia, between the Tigris and Euphrates Rivers in the Middle East. Cradle of Civilization. Many historians think that cities and towns were first formed in Sumer around 5000 BC.
At noon, on March 21 and September 23rd are the vernal and autumnal equinoxes. The sun is directly overhead at the equator at these times. On June 22nd is the summer solstice, in the Northern Hemisphere. The sun is at the 23.5 degrees Northern latitude.
On the summer solstice, areas of the Northern Hemisphere outside the tropics see the longest daylight period of the year and the midday sun is at its highest point in the sky. In Washington, D.C., the sun is above the horizon for 14 hours and 54 minutes, climbing 74.5Âº above the horizon at solar noon (1:10 p.m.).