An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 141 Search : system
Hindu-Arabic numeral system
  راژمان ِ عددهای ِ هندی-عربی   
râžmân-e adadhâ-ye Hendi-Arabi

Fr.: numération indo-arabe   

Same as → Indian numeral system.

numeral; → system.

holonomic system
  راژمان ِ هروداتیک   
râžmân-e harudâtik

Fr.: système holonomique   

A material system in which the → constraints can be expressed in the form of an equation relating the coordinates.

From Gk. → holo- "whole" + -nomic, related to nomos "law, managing, governing, custom," → -nomy; → system.

horizon coordinate system
  راژمان ِ هم‌آراهای ِ افقی   
râžmân-e hamârâhâ-ye ofoqi

Fr.: coordonnées horizontales   

The coordinate system based on the position of the observer. The horizontal plane is the fundamental plane and the coordinates are → altitude and → azimuth.

horizon; → coordinate; → system.

horizon system
  راژمان ِ افقی   
râžmân-e ofoqi

Fr.: coordonnées horizontales   

Same as → horizon coordinate system.

horizon; → system.

Indian numeral system
  راژمان ِ عددهای ِ هندی   
râžmân-e adahâ-ye Hendi

Fr.: numération indienne   

The → numeral system consisting of the numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 which evolved into the system we use today. The Indian numerals was a place-value or positional system. The Indians were the first to develop a base 10 positional system. Same as → Hindu-Arabic numeral system.

Indian, from India, → Indus; → numeral; → system.

International System of Units (SI)
  راژمان ِ جهانی ِ یکاها   
râžmân-e jahâni-ye yekâhâ

Fr.: système international des unités   

The metric system of units based on the → meter, → kilogram, → second, → ampere, → kelvin, and → candela. Also called MSKA system. Other SI units are → hertz, → radian, → newton, → joule, → watt, → coulomb, → volt, → ohm, → farad, → weber, and → tesla.

international; → system; → unit.


Fr.: inter-système   

Describing something that involves mutual relations between systems.

inter-; → system.

intersystem crossing
  گذر ِ اندر-راژمانی   
gozar-e andar-râžmâni

Fr.: conversion intersystème   

A → radiationless relaxation process in which a molecule in some excited → electronic state converts to a state of different spin → multiplicity. Intersystem crossing is analogous to → internal conversion.

intersystem; → crossing.

intersystem line
  خط ِ اندر-راژمانی   
xatt-e andar-râžmâni

Fr.: raie semi-interdite   

In spectroscopy, same as → semi-forbidden line.

inter-; → system.

isolated system
  راژمان ِ وایوتیده   
râžmân-e vâyutidé

Fr.: système isolé   

Thermodynamics: A system which has no exchange of energy or matter with surroundings. The internal energy of such a system remains constant. → closed system; → open system.

isolated; → system.

JHK system
  راژمان ِ JHK   
râžmân-e JHK

Fr.: système JHK   

1) Three → atmospheric windows in the → near infrared portion of the → electromagnetic spectrum at 1.25 (J), 1.65 (H), and 2.20 (K) μm.
2) An extension of Johnson's → photometric system into near infrared using filters corresponding to the atmospheric windows J (1.25 μm), H (1.65 μm), and K (2.20 μm), with → bandwidths 0.3 μm, 0.4 μm, and 0.6 μm respectively.

Letters of alphabet, used conventionally; → system.

lens system
  راژمان ِ عدسی   
râžmân-e adasi

Fr.: système de lentilles   

optical system.

lens; → system.

linear system
  راژمان ِ خطی   
râžmân-e xatti

Fr.: système linéaire   

Physics: A → dynamical system whose evolution is a linear process. If a change in any variable at some initial time produces a change in the same or some other variable at some later time, twice as large a change at the same initial time will produce twice as large a change at the same later time.

linear; → system.

Magellanic System
  راژمان ِ ماژلانی   
râžmân-e Magellani

Fr.: système magellanique   

A system consisting of the → Magellanic Clouds, the → Magellanic Bridge, and the → Magellanic stream.

Magellanic Clouds; → system.

mechanical system
  راژمان ِ مکانیکی   
râžmân-e mekâniki

Fr.: système mécanique   

1) Any system of elements that interact according to the laws of → mechanics (as distinguished from chemical, electrical, thermal, etc.).
2) A collection of → machines functioning together to achieve the transfer of motion.

mechanical; → system.

metric system
  راژمان ِ متری   
râšmân-e metri

Fr.: système métrique   

A standard system of measurement using decimal units, in which the units of length, time, and mass are meter, second, and kilogram respectively.

metric; → system.

Milky Way system
  راژمان ِ راه ِ شیری   
râžmân-e râh-e širi

Fr.: Voie lactée   

The huge star system of which the Sun is a member. Same as the Galaxy or the Milky Way galaxy.

Milky Way; → system.

MK system


A system of stellar → spectral classification. The same as → Morgan-Keenan classification. Also called MKK system, → Yerkes system.

Morgan-Keenan classification.

MKS system
  راژمان ِ MKS   
râžmân-e MKS

Fr.: système MKS   

The system of → MKS units.

MKS unit; → system.

multiplanet system
  راژمان ِ بس-سیاره‌ای   
râžmân-e bas-sayâre-yi

Fr.: système multi-planète   

A stellar system with more than one orbiting planet.

multi-; → planet; → system.

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