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- Spherical_astronomy abstract "Spherical astronomy or positional astronomy is the branch of astronomy that is used to determine the location of objects on the celestial sphere, as seen at a particular date, time, and location on the Earth. It relies on the mathematical methods of spherical geometry and the measurements of astrometry.This is the oldest branch of astronomy and dates back to antiquity. Observations of celestial objects have been, and continue to be, important for religious and astrological purposes, as well as for timekeeping and navigation. The science of actually measuring positions of celestial objects in the sky is known as astrometry.The primary elements of spherical astronomy are coordinate systems and time. The coordinates of objects on the sky are listed using the equatorial coordinate system, which is based on the projection of the Earth's equator onto the celestial sphere. The position of an object in this system is given in terms of right ascension (α) and declination (δ). The latitude and local time can then be used to derive the position of the object in the horizontal coordinate system, consisting of the altitude and azimuth.The coordinates of celestial objects such as stars and galaxies are tabulated in a star catalog, which gives the position for a particular year. However, the combined effects of precession and nutation will cause the coordinates to change slightly over time. The effects of these changes in the movement of the Earth are compensated by the periodic publication of revised catalogs.To determine the position of the Sun and planets, an astronomical ephemeris (a table of values that gives the positions of astronomical objects in the sky at a given time) is used, which can then be converted into suitable real-world coordinates.The unaided human eye can detect about 6000 stars, of which about half are below the horizon at any one time. On modern star charts, the celestial sphere is divided into 88 constellations. Every star lies within a constellation. Constellations are useful for navigation. Polaris lies close to due north to an observer in the northern hemisphere. This star is always at a position nearly over the North Pole.".
- Spherical_astronomy wikiPageExternalLink index.html.
- Spherical_astronomy wikiPageExternalLink positional.htm.
- Spherical_astronomy wikiPageExternalLink jnovas.
- Spherical_astronomy wikiPageExternalLink tutorial.html.
- Spherical_astronomy wikiPageID "2039039".
- Spherical_astronomy wikiPageRevisionID "595923506".
- Spherical_astronomy hasPhotoCollection Spherical_astronomy.
- Spherical_astronomy subject Category:Astrological_aspects.
- Spherical_astronomy subject Category:Astrometry.
- Spherical_astronomy subject Category:Spherical_astronomy.
- Spherical_astronomy type Abstraction100002137.
- Spherical_astronomy type Aspect105850624.
- Spherical_astronomy type AstrologicalAspects.
- Spherical_astronomy type Cognition100023271.
- Spherical_astronomy type Concept105835747.
- Spherical_astronomy type Content105809192.
- Spherical_astronomy type Feature105849789.
- Spherical_astronomy type Idea105833840.
- Spherical_astronomy type Property105849040.
- Spherical_astronomy type PsychologicalFeature100023100.
- Spherical_astronomy comment "Spherical astronomy or positional astronomy is the branch of astronomy that is used to determine the location of objects on the celestial sphere, as seen at a particular date, time, and location on the Earth. It relies on the mathematical methods of spherical geometry and the measurements of astrometry.This is the oldest branch of astronomy and dates back to antiquity.".
- Spherical_astronomy label "Astronomia sferica".
- Spherical_astronomy label "Astronomia sferyczna".
- Spherical_astronomy label "Astronomie de position".
- Spherical_astronomy label "Astronomía de posición".
- Spherical_astronomy label "Spherical astronomy".
- Spherical_astronomy label "Sphärische Astronomie".
- Spherical_astronomy label "Сферическая астрономия".
- Spherical_astronomy label "علم الفلك الكروي".
- Spherical_astronomy label "球面天文学".
- Spherical_astronomy label "球面天文学".
- Spherical_astronomy sameAs Sférická_astronomie.
- Spherical_astronomy sameAs Sphärische_Astronomie.
- Spherical_astronomy sameAs Σφαιρική_αστρονομία.
- Spherical_astronomy sameAs Astronomía_de_posición.
- Spherical_astronomy sameAs Astronomie_de_position.
- Spherical_astronomy sameAs Astronomi_bola.
- Spherical_astronomy sameAs Astronomia_sferica.
- Spherical_astronomy sameAs 球面天文学.
- Spherical_astronomy sameAs Astronomia_sferyczna.
- Spherical_astronomy sameAs m.06gxp_.
- Spherical_astronomy sameAs Q1129343.
- Spherical_astronomy sameAs Q1129343.
- Spherical_astronomy sameAs Spherical_astronomy.
- Spherical_astronomy wasDerivedFrom Spherical_astronomy?oldid=595923506.
- Spherical_astronomy isPrimaryTopicOf Spherical_astronomy.