Stereographic projection is a mapping technique that projects a sphere onto a plane. The Southern Hemisphere is the half of a planet that is south of its equator, the word hemisphere literally means, half sphere. It is also that half of the celestial sphe
Stereographic projection is a mapping technique that projects a sphere onto a plane. The Southern Hemisphere is the half of a planet that is south of its equator, the word hemisphere literally means, half sphere. It is also that half of the celestial sphere north of the celestial equator. The Hevelius Firmamentum was the first star atlas to rival Bayer's Uranometria in accuracy, utility, innovation, and influence. Hevelius was perhaps the most active observational astronomer of the last half of the seventeenth century. His star atlas is notable for many reasons. It contains 56 large, double page engraved star maps. The star positions for the charts were derived from his own star catalog, based on his own observations, which was first published along with the atlas. It is unique among the Grand Atlases in choosing to depict the constellations as they would appear on a globe, that is, from the outside looking in, rather than from a geocentric point of view, as Bayer and most others adopted.
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