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what is an imaginary sphere of infinite radius with earth at its center​

Sagot :

Answer:

celestial sphere

Explanation:

the celestial sphere is an imaginary globe of infinite radius at whose center is located the earth. In the "shell" of the sphere are embedded the stars and the sun. The earth is imagined to be fixed, and the celestial sphere to be rotating from east to west, its axis being the prolongation of that of the earth.

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Answer:

Celestial Sphere

  •          The celestial sphere is an imaginary globe of infinite radius at whose center is located the earth. In the "shell" of the sphere are embedded the stars and the sun. The earth is imagined to be fixed, and the celestial sphere to be rotating from east to west, its axis being the prolongation of that of the earth. Thus, to the naked eye the pole star remains nearly stationary.

  •          The portion of the celestial sphere seen by the observer is the hemisphere above the plane of his own horizon. A vertical line at the position of the observer coincides with the plumb line and is normal to the observer's horizon plane. The point in intersection of the vertical line and celestial sphere boundary is the zenith. A corresponding point in the opposite hemisphere is called the observer's nadir.

  •          The celestial equator is the great circle formed by the intersection of the earth's equatorial plane with the surface of the celestial sphere.

  •          The celestial poles are the points where the extended earth's axis pierces the celestial sphere.

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