- Andromeda
- Aquarius
- Aquila
- Aquila was one of the 48 constellations described by the second-century astronomer Ptolemy.
- Ara
- Argo Navis
- Aries
- Auriga
- Boötes
- Cancer
- Canis Major
- Canis Minor
- Capricornus
- Cassiopeia
- Centaurus
- Cepheus
- Cetus
- Corona Australis
- Corona Borealis
- Corvus
- Crater
- Cygnus
- Delphinus
- Draco
- Equuleus
- Eridanus
- Gemini
- Hercules
- Hydra
- In the first century, Ptolemy’s Almagest established the common Western depiction of Aquarius.
- Leo
- Lepus
- Libra
- Lupus
- Lyra
- Ophiuchus
- Orion
- Pegasus
- Perseus
- Pisces
- Piscis Austrinus
- Ptolemy (Wikipedia)
Claudius Ptolemy (/ˈtɒləmi/; Greek: Πτολεμαῖος, Ptolemaios; Latin: Claudius Ptolemaeus; c. 100 – c. 170 AD) was a Roman mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importance to later Byzantine, Islamic, and Western European science. The first is the astronomical treatise now known as the Almagest, although it was originally entitled the Mathēmatikē Syntaxis or Mathematical Treatise, and later known as The Greatest Treatise. The second is the Geography, which is a thorough discussion on maps and the geographic knowledge of the Greco-Roman world. The third is the astrological treatise in which he attempted to adapt horoscopic astrology to the Aristotelian natural philosophy of his day. This is sometimes known as the Apotelesmatika (lit. “On the Effects”) but more commonly known as the Tetrábiblos, from the Koine Greek meaning “Four Books”, or by its Latin equivalent Quadripartite.
- Sagitta
- Sagittarius
- Scorpius
- Serpens
- Taurus
- The magnitude scale dates to before the ancient Roman astronomer Claudius Ptolemy, whose star catalog popularized the system by listing stars from 1st magnitude (brightest) to 6th magnitude (dimmest). The modern scale was mathematically defined in a way to closely match this historical system.
- The stars of Canes Venatici are not bright. In classical times, they were listed by Ptolemy as unfigured stars below the constellation Ursa Major in his star catalogue.
- Triangulum
- Ursa Major
- Ursa Minor
- Virgo