This process is broken down into seven layers; Application Layer, Presentation Layer, Session Layer, Transport Layer, Network Layer, Data Link Layer, and Physical Layer. When a person communicates to another person on a network the information passes through these layers.
Ptolemy was an astronomer and mathematician. He believed that the Earth was the center of the Universe. The word for earth in Greek is geo, so we call this idea a geocentric theory.
The first globe was created by a German mapmaker named Martin Behaim in 1492. He was inspired by the discoveries of Nicolaus Copernicus, a Polish astronomer who suggested that the Earth and its surrounding planets were round, not flat. He also proposed that the Earth was not the center of the Universe, as many people thought. Behaim called his globe an âErdapfel,â or âEarth Apple.â.