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Former Constellations
Former constellations are old historical Western constellations that for various reasons are no longer widely recognised or are not officially recognised by the International Astronomical Union (IAU). Prior to 1930, many of these defunct constellations were traditional in one or more countries or cultures. Some only lasted decades but others were referred to over many centuries. All are now recognised only for having classical or historical value. Many former constellations had complex Latinised names after objects, people, or mythological or zoological creatures. Others with unwieldy names were shortened for convenience. For example, Scutum Sobiescianum was reduced to Scutum, Mons Mensae to Mensa, and Apparatus Sculptoris to Sculptor. Some of the Northern Sky's former constellations were placed in the less populated regions between the traditional brighter constellations just to fill gaps. In the Southern Sky, new constellations were often created from about the 15th century ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argo Navis - Prodromus Astronomiae 1690 (436433)
In Greek mythology, the ''Argo'' ( ; ) was the ship of Jason and the Argonauts. The ship was built with divine aid, and some ancient sources describe her as the first ship to sail the seas. The ''Argo'' carried the Argonauts on their quest for the Golden Fleece from Iolcos to Colchis. After the journey, the ship was retired and dedicated to Poseidon, the divine ruler of the seas. The ship has gone on to be used as a motif in a variety of sources beyond the original myth from books, films and more. Name Most accounts name the ship after her builder, Argus. The adjectival form is ''Argoan'' , from Greek ''Ἀργῶος'' through Latin ''Argōus''. Diodorus Siculus records that some thought the name was derived from an ancient Greek word for "swift" to indicate that the ship was designed to move quickly. Cicero, the Roman senator and orator, proposed that it was named after the Argives, a name for the Greek people of Argos in the Peloponnese that was commonly used by Homer. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Declination
In astronomy, declination (abbreviated dec; symbol ''δ'') is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. The declination angle is measured north (positive) or south (negative) of the celestial equator, along the hour circle passing through the point in question. The root of the word ''declination'' (Latin, ''declinatio'') means "a bending away" or "a bending down". It comes from the same root as the words ''incline'' ("bend forward") and ''recline'' ("bend backward"). In some 18th and 19th century astronomical texts, declination is given as ''North Pole Distance'' (N.P.D.), which is equivalent to 90 – (declination). For instance an object marked as declination −5 would have an N.P.D. of 95, and a declination of −90 (the south celestial pole) would have an N.P.D. of 180. Explanation Declination in astronomy is comparable to geographic latitude, projected onto the celestial sphere, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
53 Eridani
53 Eridani (abbreviated 53 Eri), also designated l Eridani (l Eri), is a binary star in the constellation of Eridanus. The system has a combined apparent magnitude of 3.87. Parallax estimates made by the ''Hipparcos'' spacecraft put it at a distance of about 110 light-years, or 33.7 parsecs, from the Sun. The two components are designated 53 Eridani A (officially named Sceptrum) and B. Nomenclature ''53 Eridani'' is the system's Flamsteed designation; ''l Eridani'' is its Bayer designation. The designations of the two components as ''53 Eridani A'' and ''B'' derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU). 53 Eridani bore the traditional name ('scepter'), as it was one of the brighter stars, designated "p Sceptri (Brandenburgici)", in the obsolete constellation of Sceptrum Brandenburgicum. The constellation was coined by Gottfried Kirch to honor the B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
