Northern Celestial Hemisphere

The Northern Celestial Hemisphere or the Northern Sky is part of a rotating astronomical region in the sky. It is the northern hemisphere of the celestial sphere.

The northern sky (northern star (s) sky, northern star (s) sky) is that half of the starry sky, which is north of the sky equator. It can be overlooked from the North Pole. The farther south, the less is visible to the observer.

In good visibility conditions, the observer encompasses around 2000 freely visible fixed stars, with the use of a field glass about 20,000 to 40,000 stars.

In the context of astronomical discussions or writing about celestial mapping, it may also simply then be referred to as the Northern Hemisphere.

For the purpose of celestial mapping, the sky is considered by astronomers as the inside of a sphere divided in two halves by the celestial equator. The Northern Sky or Northern Hemisphere is therefore that half of the celestial sphere that is north of the celestial equator. Even if this one is the ideal projection of the terrestrial equatorial onto the imaginary celestial sphere, the Northern and Southern celestial hemispheres must not be confused with descriptions of the terrestrial hemispheres of the Earth itself.

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