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Thursday, November 26, 2009

Globe

A globe is a three-dimensional scale model of Earth (terrestrial globe) or other spheroid celestial body such as a planet, star, or moon. It may also refer to a spherical representation of the celestial sphere, showing the apparent positions of the stars and constellations in the sky (celestial globe). The word "globe" comes from the Latin word globus, meaning round mass or sphere.A globe is the only geographical representation that has negligible distortion over large areas; all flat maps are created using a map projection that inevitably introduces an increasing amount distortion the larger the area that the map shows. A typical scale for a terrestrial globe is roughly 1:40 million.
Sometimes a globe has relief, showing topography; in the case of a globe of the Earth the elevations are exaggerated, otherwise they would be hardly visible. Most modern globes are also imprinted with parallels and meridians so that one can (if only approximately due to scale) tell the coordinates of a specific point on the surface of the planet.

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