#constellation

• Alcyone — The brightest star in the Pleiades cluster (Eta Tauri), located in the constellation of Taurus, named after one of the seven mythological daughters of Atlas and Pleione. In astrophysics, it represents a blue-white giant star with an extremely high rotational velocity, surrounded by a massive ejected gas disk.
• Aldebaran — The brightest star in the constellation of Taurus (Alpha Tauri) and the fourteenth-brightest star in the night sky, located approximately 65 light-years from Earth. It is a red giant star, much cooler than the Sun, but with a diameter about 44 times larger, easily recognizable due to its distinct reddish-orange hue.
• Andromeda — A common typographical error or digital misspelling for the correct term Andromeda. In an astronomical context, it refers to the giant spiral galaxy neighboring the Milky Way (M31) or to the northern hemisphere constellation. In a mythological context, it represents the Ethiopian princess rescued by Perseus from the clutches of a sea monster, later becoming a stellar symbol due to ancient Greek legends.
• Andromeda — A heroine in Greek mythology, daughter of King Cepheus and Cassiopeia, rescued from a sea monster by Perseus. In modern astronomy, the term designates a northern constellation and, notably, the Andromeda Galaxy (M31), a massive spiral galaxy located structurally as the Milky Way's closest major galactic neighbor.
• Andromedid — A meteor belonging to the Andromedids, a meteor shower historically associated with the disintegration of Biela's Comet. This structural astronomical phenomenon has its radiant in the Andromeda constellation and is recognized for spectacular meteor storms recorded in the 19th century, currently remaining a faint shower tracked for comet debris analysis.
• Antinous — The original Latin form of the name Antinou; a term used in international archaeology to designate the sculptural typology associated with Hadrian's favorite. It also names a historical constellation located south of Aquila, introduced by Hadrian into the star catalog and used in European astronomy until it was officially discarded by the International Astronomical Union.
• Ararul — The definite articulated form of the archaic and popular noun 'arar', designating the farmer or plowman who drives the plow and performs the soil tilling. In Romanian rural traditions and legends, the term also carries a special astronomical connotation, being the popular name assigned to the Orion constellation, viewed by peasants as a mythological indicator of the optimal time to start spring agricultural works.
• Arcturus — The proper name of the brightest star in the constellation Boötes and the fourth-brightest star in the entire night sky, being an orange giant located approximately 36.7 light-years from Earth. In mythology, the name originates from ancient Greek and means 'guardian of the bear', due to its structural proximity to the Ursa Major constellation.
• Argo — 1. In Greek mythology, the name of the legendary ship built by the Argonauts under Jason's guidance to sail to Colchis in search of the Golden Fleece. 2. In astronomy, the name of a former massive constellation in the Southern Hemisphere (Argo Navis), later divided by astronomers into three distinct constellations: Carina (The Keel), Puppis (The Poop Deck), and Vela (The Sails).
• Aries — Latin and international designation for the constellation of Ram and the first sign of the classical European zodiac; represents a historical reference point in astronomy (the Aries point or vernal equinox), used as a structural element in celestial coordinate systems to measure right ascension.
• Astraea — The virgin goddess of innocence, purity, and justice in Greek mythology, daughter of Astraeus and Eos, considered the last immortal to leave Earth at the end of the Iron Age to seek refuge in the sky, where she became the constellation Virgo. In astronomy, it denotes 5 Astraea, a large main-belt asteroid discovered in 1845 by Karl Ludwig Hencke, and in zoology, it represents a genus of medium to large sea snails in the family Turbinidae.
• Astrognosy — An old descriptive branch of practical astronomy that deals with identifying, naming, and mapping constellations, as well as recognizing the position of the main stars and celestial bodies visible to the naked eye or rudimentary instruments. Unlike modern astrophysics, this classic field focuses strictly on sky orientation, traditional star charts, and celestial nomenclature.
• Astroscope — A simplified optical instrument or astronomical device used historically or for educational purposes for the direct observation, visual examination, and projection of star charts onto the night sky. In older technical terminology, it defined a device equipped with interchangeable discs that aided in the rapid identification of constellations and planetary positions, functioning as a mechanical precursor to modern portable planetariums.
• Charioteer — A chariot driver in ancient Rome and Greece, renowned for his exceptional skills in guiding quadrigae within public arenas and circuses. When capitalized (Auriga), it designates a famous constellation in the northern hemisphere (known in Romanian as Vizitiul), whose brightest star is Capella.