Astronomical chart showing the centaur Sagittarius with bow and arrow, also shows a laurel wreath, a telescope, and a microscope forming the constellations. Sagittarius is a constellation of the zodiac, the one containing the galactic center. Its name is Latin for the archer. Sagittarius is commonly represented as a centaur drawing a bow. Sagittarius is the ninth astrological sign, which is associated with the constellation Sagittarius. Corona Australis is a constellation in the Southern Hemisphere. Its Latin name means southern crown. Sagittarius and Corona Australis are two of the 48 constellations described by the 2nd century astronomer Ptolemy, and they remain two of the 88 modern constellations defined by the International Astronomical Union. Microscopium is a small constellation in the southern sky. Its name is Latin for microscope. Telescopium is a minor southern constellation. Its name is a Latinized form of the Greek word for telescope. Both were created in the 18th century by Nicolas Louis de Lacaille, a French astronomer and student of the southern skies.