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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 .
The Uranometria contained 48 maps of Ptolemaic constellations, a plate of the southern constellations and two plates showing the entire northern and southern hemispheres in stereographic polar projection. [19] Polish astronomer Johannes Hevelius published his Firmamentum Sobiescianum star atlas posthumously in 1690. It contained 56 large ...
The Sagittarius constellation that includes the galactic centre is a southern constellation as well as both Magellanic Clouds. This, combined with clearer skies, makes for excellent viewing of the night sky from the Southern Hemisphere with brighter and more numerous stars.
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The constellation's three-letter abbreviation, as adopted by the International Astronomical Union in 1922, is "Ori". [2] Orion is most visible in the evening sky from January to April, [3] winter in the Northern Hemisphere, and summer in the Southern Hemisphere.
From the southern hemisphere it appears upside down and lower in the sky during the summer months. [2] The Winter Triangle surrounds most of the faint constellation Monoceros, although its brightest stars are of fourth magnitude and hardly noticeable to the naked eye. The triangle includes two first magnitude stars, while Sirius is even brighter.
The Northern Hemisphere equivalent of the Tropic of Capricorn is the Tropic of Cancer. The Tropic of Capricorn's position is not fixed, but constantly changes because of a slight wobble in the Earth's longitudinal alignment relative to its orbit around the Sun. Earth's axial tilt varies over a 41,000 year period from about 22.1 to 24.5 degrees ...
Canis Major is a constellation in the southern celestial hemisphere. In the second century, it was included in Ptolemy 's 48 constellations, and is counted among the 88 modern constellations . Its name is Latin for "greater dog" in contrast to Canis Minor , the "lesser dog"; both figures are commonly represented as following the constellation ...