|Automatic translation||Updated June 01, 2013|
A constellation is a group of stars of the vault heavenly which enough close relations looked the appearance imagination of a figure onto the sky. A constellation is thus a asterism astronomy, an asterism is a remarkable figure drawn by particularly brilliant stars. particular. In the sky the stars of a constellation are very remote some of the others but seem grouped together there figures.
NB: by agreement the names of the stars of a constellation are prefixed by a Greek letter followed by the first 3 letters of the constellation, the example: α Ori, β Ori,... (Greek letters: α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ ς σ τ υ φ χ ψ ω).
The constellation of the Boötes has a shape looking like that of a kite. It is especially known thanks to stars Arcturus α BOo (magnitude 0,03 to 36,71 AL) and Izar ε BOo (magnitude 2,37 to 209,75 AL).
Arcturus the most brilliant have a diameter equivalent to 23 solar diameters.
Lion constellation (Leo)
The constellation of the Lion becomes identified thanks to a group of stars forming a characteristic drawing of sickle. We can easily observe this constellation in our hemisphere in spring.
This constellation contains several brilliant stars, such Regulus (α Leonis), the heart of the Lion, and Denebola (β Leonis), its tail.
Small Lion constellation (Leo Minor)
The Small Lion is a boreal constellation constituted by Hévélius to cover a zone devoid of name, we find there that stars of the fourth magnitude.
The Small Lion is placed over the head of the Lion. To find it, it is necessary to look between the constellation of the Great Bear and the Lion.
The constellation of the Virgo is easily observable of our north hemisphere and serves as mark for the identification of the other constellations.
It is an immense constellation (the second of the sky, after the Hydra) and extremely former.