jueves, 10 de marzo de 2011

What is longitud? What is latitud? History of prime meridian (Greenwich).

1.- What is longitud? The vertical longitud lines are also known as meridians. They converge at the poles and are widest at the equator On the globe, lines of constant longitude ("meridians") extend from pole to pole, like the segment boundaries on a peeled orange.
2.- What is latitud? Latitude lines are also known as parallels since they are parallel and are an equal distant from each other. Imagine the Earth was a transparent sphere. Through the transparent Earth we can see its equatorial plane, and its middle the point is O, the center of the Earth.
3.-What is the Equator? The equator is 0 degree latitude. This imaginary line, which runs through parts of South America, Africa, and Asia, is officially the halfway point between the North Pole and the South Pole.
4.- History of prime meridian (Greenwich).
The prime meridian is 0 degrees longitude. This imaginary line runs through the United Kingdom, France, Spain, western Africa, and Antarctica.
By using the equator and prime meridian, we can divide the world into four hemispheres, north, south, east, and west. For instance, the United States is in the Western Hemisphere (because it is west of the prime meridian) and also in the Northern Hemisphere (because it is north of the equator).
Fernanda and Julia