An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 405
geodetic precession
  پیشایان ِ کهین‌رهی   
pišâyân-e kehinrahi

Fr.: précession géodésique   

A → relativistic effect on the precession motion of a gravitational system due to the → curvature of the → space-time. When a body revolves around a primary, the → rotation axis of the orbiting body follows the curvature of spece-time. Over time the space-time warping causes the spin axis to precess. In the case of the Earth-Moon system, this means a small → direct motion of the → equinox along the → ecliptic, amounting to 1''.915 per century. The geodetic precession is given by: ψg = (3/2) k2 (1 - e) n, where k is the → constant of aberration (in radians), e the → eccentricity of the Earth and n the mean angular orbital motion of the Earth (in arcsec/cy). Also called → Einstein-de Sitter effect and → geodesic precession.

geodetic; → precession

geodetic refraction
  شکست ِ زمین‌سنجیک   
šekast-e zamin-sanjik

Fr.: réfraction géodésique   

The limiting case of → astronomical refraction when the light path is entirely within the Earth's atmosphere.

geodetic; → refraction.

geodetic vertical
  هجین ِ زمین‌سنجیک   
hajin-e zamin-sanjik

Fr.: vertical géodésique   

The direction defined by the → normal to the → reference ellipsoid at the point in question.

geodetic; → vertical.

geodetic zenith
  سرسوی ِ زمین‌سنجیک   
sarsu-ye zamin-sanjik

Fr.: zénith géodésique   

The intersection of the prolongation of the outward → normal to the → reference ellipsoid at the point in question with the → celestial sphere.

geodetic; → zenith.

geographic
  زمین‌نگاریک   
zaminnegârik

Fr.: géographique   

Of or pertaining to → geography.

geography; → -ic.

geographic coordinate system
  راژمان ِ هماراهای ِ زمین‌نگاریک   
râžmân-e hamârâhâ-ye zaminnegârik

Fr.: système de coordonnées géographiques   

A → ccordinate system on the surface of the Earth that defines every location by a set of numbers and letters, indicating the → latitude and → longitude.

geographic; → coordinate; → system.

geographic latitude
  ورونای ِ زمین‌نگاریک   
varunâ-ye zaminnegârik

Fr.: latitude géographique   

A synonym for → geodetic latitude or → astronomical latitude.

geographic; → latitude.

geographic north pole
  قطب ِ هودر ِ زمین‌نگاریک   
qotb-e hudar-e zaminnegârik

Fr.: pôle nord géographique   

north pole.

geographic; → north; → pole.

geographic south pole
  قطب ِ دشتر ِ زمین‌نگاریک   
qotb-e daštar-e zaminnegârik

Fr.: pôle sud géographique   

south pole.

geographic; → south; → pole.

geography
  زمین‌نگاری   
zaminnegâri (#)

Fr.: géographie   

The science dealing with the areal differentiation of the Earth's surface, as shown in the character, arrangement, and interrelations over the world of such elements as climate, elevation, soil, vegetation, population, land use, industries, or states, and of the unit areas formed by the complex of these individual elements (Dictionary.com).

geo-; → -graphy.

geoid
  زمین‌وار   
zaminvâr (#)

Fr.: géoïde   

The form of the → Earth obtained by taking average sea level surface and extending it across the continents. In other words, the → equipotential surface ("mean sea level") of the Earth's → gravitational field. The geoid is considered to represent the true physical figure of the Earth, in contrast to the → reference ellipsoid, which is idealized geometrical figure of the Earth.

geo-; → -oid.

geologic
  زمین‌شناختی   
zaminšenâxti (#)

Fr.: géologique   

Of, pertaining to, or based on → geology. Also geological.

From geolog(y), → geology, + → -ic.

geologic time
  زمان ِ زمین‌شناختی   
zamân-e zaminšenâxti (#)

Fr.: temps géologique   

The long span of time from the end of the formation of Earth during which our planet underwent its major transformations.

geologic; → time.

geology
  زمین‌شناسی   
zaminšenâsi (#)

Fr.: géologie   

The scientific study of the composition, structure, and physical history of the Earth.

geo- + → -logy.

geomagnetic
  زمین‌مغناتیسی، زمین‌مغناتی   
zamin-meqnâtisi, zamin-meqnâti

Fr.: géomagnétique   

Of or pertaining to → geomagnetism.

geo-; → magnetic.

geomagnetic activity
  ژیرندگی ِ زمین‌مغناتیسی، ~ زمین‌مغناتی   
žirandegi-ye zamin-meqnâtisi, ~ zamin-meqnâti

Fr.: activité géomagnétique   

The natural variations in the → geomagnetic field due to interactions of the Earth's field and → magnetosphere with energetic particles from the Sun.

geomagnetic; → activity.

geomagnetic field
  میدان ِ زمین‌مغناتیسی، ~ زمین‌مغناتی   
meydân-e zamin-meqnâtisi, ~ zamin-meqnâti

Fr.: champ géomagnétique   

The magnetic field that is generated within the Earth and extends out around the Earth. The intensity of the magnetic field at the Earth's surface is about 0.32 → gauss at the equator and 0.62 gauss at the north pole.

geomagnetic; → field.

geomagnetic storm
  توفان ِ زمین‌مغناتیسی، ~ زمین‌مغناتی   
tufân-e zamin-meqnâtisi, ~ zamin-meqnâti

Fr.: orage géomagnétique   

A violent disturbance of the Earth's magnetic field, distinct from regular diurnal variations, following a → solar flare or → coronal mass ejection.

geomagnetic; → storm.

geomagnetism
  زمین‌مغنات‌مندی   
zamin-meqnâtmandi

Fr.: géomagnetsme   

A branch of geophysics concerned with the study of the Earth's → geomagnetic field, including its origin, spatial extent, and variations in time.

geo-; → magnetism.

geometric
  هندسی   
hendesi (#)

Fr.: géométrique   

Of or pertaining to geometry or to the principles of geometry.

Adj. of → geometry

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