axtaršenâxti, axtaršenâsik, axtari (#)
Of or relating to → astronomy.
Astronomical, from L. astronomic(us), → astronomy + → -ic, + → -al adj. suffix.
Axtaršenâxti, from axtaršenâxt,
variant of axtaršenâsi, → astronomy
+ -i adj. suffix.
Fr.: horloge astronomique
A precise pendulum clock with separate dials for seconds, minutes, and hours. It was originally used by astronomers to calculate astronomical time.
→ astronomical; → clock.
pâyâ-ye axtaršenâsik, ~ axtaršenâxti (#)
Fr.: constante astronomique
A precisely measured fundamental quantity in astronomy, such as the → solar parallax, the → constant of aberration, and the → obliquity of the ecliptic.
→ astronomical; → constant.
hamârâhâ-ye axtaršenâsik, ~ axtarsršnâxti (#)
Fr.: coordonnées astronomiques
Values in a reference system used to relate the position of a body on the celestial sphere.
→ astronomical; → coordinates.
Fr.: horizon astronomique
The intersection of a plane perpendicular to the radius of the Earth through the observer's eye with the celestial sphere. Same as → true horizon. Because the → celestial sphere has an infinite radius, two observers at different heights above sea level, but placed on the same vertical line, have the same astronomical horizon. Because of → dip of the horizon, the astronomical horizon always lies above the → sea horizon. But on land it is usually hidden by trees, hills, and buildings which determine the observer's → apparent horizon.
→ astronomical; → horizon.
Fr.: instrument astronomique
A device used to observe and study → astronomical objects.
→ astronomical; → instrument.
Fr.: latitude astronomique
The angle between the → equatorial plane and the true → vertical at a point on the surface.
→ astronomical; → latitude.
barâxt-e axtaršenâsik, ~ axtari
Fr.: objet astronomique
A naturally occurring physical entity or association that lies beyond the Earth's atmosphere and can be studied observationally. In other words, a gravitationally bound structure that is associated with a position in space, but may consist of multiple independent astronomical objects. A list of astronomical objects includes → planets, → asteroids, → comets, → stars, → nebulae, galaxies (→ galaxy), → galaxy clusters, → pulsars, and → black holes. Note that → celestial body, → celestial object, and → heavenly body are less technical terms for these entities.
→ astronomical; → object.
nepâhesgâh-e axtaršenâsik, ~ axtaršenâxti
Fr.: observatoire astronomique
A building, place, or institution designed and equipped for making → observations of astronomical phenomena.
→ astronomical; → observatory.
Fr.: réfraction astronomique
The → angular → displacement of a point on the → celestial sphere due to the Earth's → atmospheric refraction.
→ astronomical; → refraction.
sit-e axtaršenâsik, ~ axtaršenâxti
Fr.: site astronomique
A certain place whose characteristics, as to location, altitude, atmospheric conditions, etc., make it appropriate for astronomical observations.
→ astronomical; → site.
Fr.: table astronomique
One of a set of tables giving parameters used for calculations of positions of the Sun, the Moon, and the planets in particular in pre-telescopic astronomy. The oldest known astronomical tables are those of Ptolemy. In Modern astronomy it is usually replaced by the term → ephemeris. Same as → zij. See also → Toledan Tables, → Alfonsine Tables.
→ astronomical; → table.
nimtâb-e axtaršenâsik, ~ axtarsnâxti
Fr.: crépuscule astronomique
One of the twilight phases when the Sun's center lies between 12 and 18 degrees below the horizon. Astronomical twilight is followed or preceded by → nautical twilight. Most stars and other celestial objects can be seen during this phase. However, some of the fainter stars and galaxies may not be observable as long as the Sun is less than 18 degrees below the horizon. See also → civil twilight.
→ astronomical; → twilight.
astronomical unit (au)
yekâ-ye axtaršenâsik, ~ axtaršenâxti (#)
Fr.: unité astronomique
1) A unit of length equal to 149 597 870 700 m exactly, with symbol "au"
(re-definition at the International Astronomical Union's 28th General
Assembly in Beijing, China, August 20-31). The astronomical unit equals
1.5813 × 10-5 → light-years and
4.8481 ×10-6 → parsecs.
→ astronomical; → unit.
Infrared Astronomical Satellite (IRAS)
mâhvâre-ye axtaršenâxti-e forusorx (#)
Fr.: satellite astronomique infrarouge
An orbiting infrared telescope (60 cm mirror) which successfully operated from launch in January 1983 until the supply of coolant ran out in November 1983. It was a collaborative mission between NASA, the Netherlands, and the UK, and mapped 95% of the whole sky in the wavelength bands 12, 25, 60, and 100 microns.
→ infrared; → astronomical; → satellite.
International Astronomical Union (IAU)
Yekâyeš-e Jahâni-ye Axtaršenâsi
Fr.: Union Astronomique Internationale (UAI)
An astronomical association of astronomers that is the controlling body of world astronomy. It was founded in Brussels in 1919.
→ international; → astronomical; → union.
Strasbourg Astronomical Data Center (CDS)
Fr.: Centre de Données astronomiques de Strasbourg (CDS)
A data center dedicated to the collection and worldwide distribution of astronomical data and related information. It is located at the Strasbourg Astronomical Observatory, France. The CDS has several goals, mainly: collecting all of the useful information regarding astronomical objects in computerized form, including observational data produced by observatories on the ground or in space; upgrading these data by critical evaluations and comparisons; and distributing the results to the astronomical community. Currently the CDS services include: → SIMBAD, Aladin interactive sky atlas, and VizieR catalogues.
CDS, short for Centre de Données astronomiques de Strasbourg.