A constellation is a set of stars whose projections on the celestial vault are close enough that a civilization connects them by imaginary lines to create some form.
A constellation is usually more complex than an asterism, which can represent a part of a constellation or belong to several constellations.
Used throughout history for celestial and terrestrial spotting as well as mythological representations, the constellations appear to be clustered in the night sky, but they are usually widely dispersed in three-dimensional spacenote.
Different cultures have recognized different constellations.
Unless otherwise stated, here the term constellation refers to modern constellations.
Currently, the International Astronomical Union (IAU) divides the sky into 88 constellations with precise boundaries, so that every point of the sky belongs to a constellation and a single.
The latter are grouped in two parts, dividing the sky following more or less the two terrestrial hemispheres, the southern sky for the south and the northern sky for the north.
Boreal constellations are the oldest and correspond to the skyline visible from the Mediterranean regions by astronomers of antiquity.
They are substantially based on the Hellenic and pre-Hellenic tradition, transmitted through the medieval era.
Southern constellations were only named by Western astronomers in the fifteenth century.
Please, enlarge
Sample-video during a few minutes of clear sky, then, capture some images to get Cepheus out.
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It looks a lot like the Giraffe BUT, by observing the map of the sky of this specific moment in Paris Butte Montmartre, measuring with Arcturus, and adjusting the little bear and the big bear, it is good Cephee, no persea (looks like in the video but not the right position) and not the Giraffe =)
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