What is a contellation ?

The constellation is a set of stars connected by imaginary lines creating any form.
The form have been imagined by the Greeks. They gave names to constellations.
A long time ago, sailors could get their bearings thanks to constellations at night but during the day they 
could not find their way so they had to wait the night to find the good direction.
So here you have some constellation in Reunion’s sky “Crux" “Centaurus” “Orion” 
“Scorpio” “Canis Major” ....

In astrology there are twelve constellations but in astronomy there is thirteen constellation.
And the forgotten constellation is the constellation of the snake.

Do not believe what the astrologers say in the newspapers!
From your birth you believe that you knowing what is your zodiac signs but as there are not only 
twelve constellations, the date of beginning and end to know our horoscope change. 
Because of that we can't believe in astrology.

When we were at the observatory of "Les Makes" we saw some constellation on a computer :

The photo was taken by Kassandra.I