This plane and the path is not straight around but tilted, tipped 23.44 degrees from that of the celestial equator (which is Earth’s equator projected out onto the celestial sphere). We call this the “ ecliptic” or “ecliptic plane.” See the yellow dotted line above. (The upper and lower halves of the sphere are divided by the horizon.)Įcliptic: There is a path that the Sun appears take around this celestial sphere. Picture yourself as standing at the center inside a clear ball, with the Sun, Moon, stars, planets, and other celestial objects projected overhead onto the dome which is the upper half of the sphere. The Year’s Best Planet Display: Venus, Saturn, Jupiter Lined UpĬelestial sphere: An imaginary sphere projected into space that represents the entire sky, with an observer on Earth at its center.
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