Southern celestial hemisphere
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The southern celestial hemisphere, also called the Southern Sky, is the southern half of the celestial sphere; that is, it lies south of the celestial equator. This arbitrary sphere, on which seemingly fixed stars form constellations, appears to rotate westward around a polar axis as the Earth rotates.
At all times, the entire Southern Sky is visible from the geographic South Pole; less of the Southern Sky is visible the further north the observer is located. The northern counterpart is the northern celestial hemisphere.
Astronomy
In the context of
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.[according to whom?] The Southern Sky or Southern Hemisphere is, therefore, that half of the celestial sphere that is south 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 Earth itself.[according to whom?]
Observation
From the South Pole, in good visibility conditions, the Southern Sky features over 2,000 fixed stars that are easily visible to the naked eye, while about 20,000 to 40,000 with the aided eye.[citation needed][dubious ] In large cities, about 300 to 500 stars can be seen depending on the extent of light and air pollution.[citation needed] The farther north, the fewer are visible to the observer.[citation needed]
The brightest stars are all larger than the Sun.[
History
The first telescopic chart of the Southern Sky was made by the English astronomer Edmond Halley,[2][3] from the island of St Helena in the South Atlantic ocean and published by him in 1678.[4]
See also
References
- ISBN 978-0-521-71405-1
- ^ "Edmond Halley (1656–1742)". BBC. 2014. Retrieved 2021-07-11.
- ^ "Edmond Halley's southern star catalogue". Retrieved 2023-07-26.
- ISBN 978-1-4614-0917-5.