An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 55 Search : mica
  اخترشناختی، اخترشناسیک، اختری   
axtaršenâxti, axtaršenâsik, axtari (#)

Fr.: astronomique   

Of or relating to → astronomy.
In non astronomical contexts, of enormous magnitude; immense.

Astronomical, from L. astronomic(us), → astronomy + → -ic, + → -al adj. suffix.

Axtaršenâxti, from axtaršenâxt, variant of axtaršenâsi, → astronomy + -i adj. suffix.
Axtaršenâsik, from axtaršenâsi, → astronomy + re-introduced Mod.Pers. suffix -ik, → -ics.

astronomical clock
  ساعت ِ اخترشناسیک   
sâ'at-e axtaršenâsik

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.

astronomical constant
  پایا‌ی اخترشناسیک، ~ اخترشناختی   
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.

astronomical coordinates
  هماراها‌ی اخترشناسیک، ~ اخترشناختی   
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.

astronomical horizon
  افق ِ اخترشناسیک   
ofoq-e axtaršenâsik

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.

astronomical instrument
  سازال ِ اخترشناسیک   
sâzâl-e axtaršenâsik

Fr.: instrument astronomique   

A device used to observe and study → astronomical objects.

astronomical; → instrument.

astronomical latitude
  ورونای ِ اخترشناسیک   
varunâ-ye axtaršenâsik

Fr.: latitude astronomique   

The angle between the → equatorial plane and the true → vertical at a point on the surface.

astronomical; → latitude.

astronomical object
  بر‌آخت ِ اخترشناسیک، ~ اختری   
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.

astronomical observatory
  نپاهشگاه ِ اخترشناسیک، ~ اخترشناختی   
nepâhesgâh-e axtaršenâsik, ~ axtaršenâxti

Fr.: observatoire astronomique   

A building, place, or institution designed and equipped for making → observations of astronomical phenomena.

astronomical; → observatory.

astronomical refraction
  شکست ِ اخترشناختی   
šekast-e axtaršenâxti

Fr.: réfraction astronomique   

The → angular → displacement of a point on the → celestial sphere due to the Earth's → atmospheric refraction.

astronomical; → refraction.

astronomical site
  سیت ِ اخترشناسیک، ~ اخترشناختی   
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.

astronomical table
  جدول ِ اختری   
jadval-e axtari

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.

astronomical twilight
  نیمتاب ِ اخترشناسیک، ~ اخترشناختی   
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)
  یکا‌ی ِ اخترشناسیک، ~ اخترشناختی   
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.
2) Previous definition: The radius of a circular orbit in which a body of negligible mass, and free of perturbations, would revolve around the Sun in 2 π / k days, where k is the → Gaussian gravitational constant. This is slightly less than the semi-major axis of the Earth's orbit.

astronomical; → unit.

Barycentric Dynamical Time (TDB)
  زمان ِ توانیک ِ گرانیگاهی   
zamân-e tavânik-e gerânigâhi

Fr.: temps dynamique barycentrique (TDB)   

A time scale previously used in calculations of the orbits of solar system objects (planets, asteroids, comets, and interplanetary spacecrafts). It was based on the Terrestrial Dynamical Time, but took the relativistic effect of time dilation into account to move the origin to the solar system barycenter. It is now superseded by → Barycentric Coordinate Time (TCB).

barycenter; → dynamical; → time.

  شیمیایی، شیمیک   
šimiyâyi (#), šimik

Fr.: chimique   

Of, relating to, used in, or produced by means of chemistry.

From chemic "of alchemy," → chemistry + → -al.

Šimiyâyi, of or pertaining to šimichemistry.
Šimik, from šim- + -ik, → -ic.

chemical abundance
  فراوانی ِ شیمیایی   
farâvâni-ye šimiyâyi (#)

Fr.: abondance chimique   

The relative amount of a given → chemical element or → chemical compound with respect to another element or compound in a given sample.

chemical; → abundance.

chemical adsorption
  برشم ِ شیمیایی   
baršam-e šimiyâyi

Fr.: adsorption chimique   

Same as → chemisorption.

chemical; → adsorption.

chemical affinity
  کرونی ِ شیمیایی، ~ شیمیک   
karvani-ye šimiyâyi, ~ šimik

Fr.: affinité chimique   

The extent to which a chemical species, such as an atom or molecule, tends to combine with another to form a chemical compound.

chemical; → affinity.

chemical bond
  بند ِ شیمیک، ~ شیمیایی   
band-e šimik, ~ šimiyâyi

Fr.: liaison chimique   

A force by which chemical substances are held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons.

chemical; → bond.

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