The southern constellations were named by western astronomers after the fifteenth century. The International Astronomical Union (IAU) divides the sky into 88 constellations official with precise boundaries, so that each point in the sky belongs to a constellation. Man is fascinated by this cosmic scene that represents the sky observed without any artificial lighting. The stars all seem to hang at the same distance from the earth. The sky changes day and night throughout the year. At first sight the sky is dotted with thousands of bright and glitter stars.    
In theory, you could see a single glance about 3800 stars in reality only about 2600 are visible due to stray light. It is the rotation of the Earth creates the horizon bisecting the celestial sphere. To the pole, all the stars revolve around the zenith, in parallel to the horizon. At the equator all the stars rise and set, the celestial poles are on the horizon. Therefore, all the stars from one pole to the other are visible at certain moments of the year. At midlatitudes some stars are circumpolar  or always above the horizon while others wake up and lie down.

http://www.astronoo.com/en/rubrics/constellations.html

This is my reconstruction of the sky, I hope I have made no mistakes, in which case you must declare to me and forgive me :)

assistant: Piero Iezzi
photo: Zeiss Batis 18mm
original size 25000x12500
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