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.
Nicolaus Copernicus was an astronomer who discovered that the Sun is the center of the universe (Heliocentric Theory) and the planets and stars revolved around it.This discovery shattered the Geocentric Theory, the thought that the Earth was the center of the universe and everything revolved around it.onfidence votes 64. Nicolaus Copernicus discoved that the Earth revolves around the sun. This displaced other theories that the Earth was at the centre of the universe and that the Sun revolved around it.