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The terrestrial sphere. Start with a familiar sphere: the Earth (assume for the moment that it is spherical), spinning around an axis. The North & South Poles are where this axis meets the Earth's surface. The equator lies midway between them. The equator is an example of a great circle: one whose plane passes through the centre of the sphere.
A model globe of Earth is called a terrestrial globe. The earth’s surface is reflected in the rules of central projection. Namely, imagine two identical spheres with a common center, one of which is a larger earth, and the sphere taken is smaller. The points are then designed with imaginary beams mounted in a common center.
The Celestial Sphere Earth at center of very large sphere Because sphere is so large, observer, is also at center (figure not to scale). Stars in fixed positions on sphere
This video explains the coordinate systems used in celestial navigation, with an overview of the terrestrial and celestial spheres.This video is part of a se...
The celestial sphere is an imaginary sphere centred on the Earth onto which all stars (and other celestial bodies) can be projected. We use the celestial sphere to nd objects in the sky.
In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, which may be centered on Earth or the observer.
Positional Astronomy: The terrestrial sphere. Start with a familiar sphere: the Earth (assume for the moment that it is spherical), spinning around an axis. The North & South Poles are where this axis meets the Earth's surface. The equator lies midway between them.
