Search results
Results from the WOW.Com Content Network
North African, 9th century CE, planispheric astrolabe. Khalili Collection. A modern astrolabe made in 2013, in Tabriz, Iran.. An astrolabe (Ancient Greek: ἀστρολάβος astrolábos, ' star-taker '; Arabic: ٱلأَسْطُرلاب al-Asṭurlāb; Persian: ستارهیاب Setāreyāb) is an astronomical instrument dating to ancient times.
Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock, made in 1585 in Kassel, now at Nordiska Museet in Stockholm. An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial ...
Planetary symbols are used in astrology and traditionally in astronomy to represent a classical planet (which includes the Sun and the Moon) or one of the modern planets. The classical symbols were also used in alchemy for the seven metals known to the ancients, which were associated with the planets, and in calendars for the seven days of the week associated with the seven planets.
A classical planet is an astronomical object that is visible to the naked eye and moves across the sky and its backdrop of fixed stars (the common stars which seem still in contrast to the planets). Visible to humans on Earth there are seven classical planets (the seven luminaries ).
Gauss decided to name the planet for the goddess Vesta, and also specified that the symbol should be the altar of the goddess with the sacred fire burning on it. [ 18 ] [ 19 ] Bach's variant is a simplification of 19th-century elaborations of Gauss's altar symbol.
Canterbury Astrolabe Quadrant: medieval astrolabe found in England; Celatone: navigational aid reliant on tracking Jupiter's moons in the sky; Celestial sphere: imaginary sphere of arbitrarily large radius, concentric with the observer; Charge-coupled device: device for the movement of electrical charge
Pluto has an alternative symbol consisting of an orb over Pluto's bident: it is more common in astrology than astronomy, and was popularised by the astrologer Paul Clancy, [93] but has been used by NASA to refer to Pluto as a dwarf planet. [81] There are a few other astrological symbols for Pluto that are used locally. [93]
Planet V, a planet thought by John Chambers and Jack Lissauer to have once existed between Mars and the asteroid belt, based on computer simulations. Various planets beyond Neptune: Planet Nine, a planet proposed to explain apparent alignments in the orbits of a number of distant trans-Neptunian objects. Planet X, a hypothetical planet beyond ...