Celestial sphere

The Celestial Sphere

This is how we see the entire sky from the earth, projected to a sphere. This concept has been used for thousands of years since the stars are so far away that they seem to be fixed on an imaginary sphere. This image is oriented with the galactic plane (the Milky Way) horizontal. Concept inspiration [...]

"How did you find that?!"

The center of the earth is the center of the celestial sphere, and the sphere's pole and equatorial plane are coincident with those of the earth. See the illustration of the Celestial Sphere. We can specify precise location of objects on the celestial sphere by giving the celestial equivalent of their latitudes and longitudes. - Basics of Space Flight - Solar System Exploration: NASA Science

Celestial Sphere definition: An imaginary sphere of infinite extent with the earth at its center and on which the stars, planets, and other heavenly bodies appear to be located.

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