Northern celestial hemisphere
Northern half of the celestial sphere
Northern celestial hemisphere
The northern celestial hemisphere, also called the Northern Sky, is the northern half of the celestial sphere. Most easily viewed from the Earth's Northern Hemisphere, the hemisphere appears to rotate westward (counterclockwise) around a polar axis due to Earth's rotation. At any given time, the entire Northern Sky is visible from the geographic North Pole, while less of the hemisphere is visible the farther south the observer is located. The southern counterpart is the southern celestial hemisphere.
Read on Wikipedia · Image Roberto Mura, CC BY-SA 3.0
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