An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13176 Search : in
green flash
  درخش ِ سبز   
deraxš-e sabz (#)

Fr.: rayon vert   

A brilliant green color that occasionally appears on the upper limb of the Sun as it rises or sets.

green; → flash.

green pea
  نخود سبز   
noxod sabz

Fr.: petit pois   

A pea harvested and eaten while still green, soft, and unripe; a garden pea; usually in plural.

green; → pea.

Green Pea galaxy
  کهکشان ِ نخود سبز   
kahkešân-e noxod sabz

Fr.: galaxie petit pois   

A member of a class of galaxies of relatively small size (→ compact galaxy) having very strong → emission lines especially the → [O III] doublet and an unusually large → equivalent width of up to 1000 Å. They were first noted because of their peculiar bright green color and small size, unresolved in → Sloan Digital Sky Survey imaging. Green Peas are similar to high-→ redshift  → Lyman alpha emitting galaxies (LAEs) in many respects (small sizes, low → stellar masses, 108-10 → solar masses (Msun), low metallicities for their stellar masses, high → specific star formation rates (sSFR), and large [O III] λ5007/[O II]λ3727 ratios. Green Peas are relatively luminous and massive galaxies compared to the faint-end → dwarf starburst galaxies and LAEs (See Yang et al, 2017, arxiv/1706.02819, and references therein).

Such called because of their appearance and green color (mainly due to very strong optical emission line [O III] 5007 Å) in composite images; → green; → pea; → galaxy.

greenhouse
  گرمخانه   
garmxâné (#)

Fr.: serre   

A building with transparent walls and roof, usually of glass, for the cultivation and exhibition of plants under controlled conditions (Dictionary.com).

green; → house.

Garmxâné, literally "warm house," from garm, → warm, + xâné, → house.

greenhouse effect
  اُسکر ِ گرمخانه   
oskar-e garmxâné

Fr.: effet de serre   

An increase in → temperature caused when incoming → solar radiation is passed but outgoing → thermal radiation is trapped by the → atmosphere. The major factors for this effect are → carbon dioxide and → water vapor. The greenhouse effect is very important on Venus and Earth but very weak on Mars. On average, about one third of the solar radiation that hits the Earth is reflected back to space. The Earth's surface becomes warm and emits → infrared radiation. The → greenhouse gases trap the infrared radiation, thus warming the atmosphere. Without the greenhouse effect the Earth's average global temperature would be -18° Celsius, rather than the present 15° Celsius. However, human activities are causing greenhouse gas levels in the atmosphere to increase.

greenhouse; → effect.

greenhouse gases
  گاز‌های ِ دارای ِ اُسکر ِ گرمخانه   
gâzhâ-ye dârâ-ye oskar-e garmxâné

Fr.: gaz à effet de serre   

Gases responsible for the greenhouse effect. These gases include: water vapor (H2O), carbon dioxide (CO2); methane (CH4); nitrous oxide (N2O); chlorofluorocarbons (CFxClx); and tropospheric ozone (O3).

greenhouse; → gas.

Greenwich Apparent Sidereal Time (GAST)
  زمان ِ اختری ِ پدیدار ِ گرینویچ   
zamân-e axtari-ye padidâr-e Greenwich

Fr.: temps sidéral apparent de Greenwich   

The → Greenwich Mean Sidereal Time corrected for → nutation. Therefore, it is measured with respect to the → true vernal equinox. GAST and GMST differ by the → equation of the equinoxes.

Greenwich Meridian; → apparent; → sidereal; → time.

Greenwich Mean Sidereal Time (GMST)
  زمان ِ اختری ِ میانگین ِ گرینویچ   
zamân-e axtari-ye miyângin-e Greenwich

Fr.: temps sidéral moyen de Greenwich   

The → sidereal time related to the angle between the → prime meridian and the → mean vernal equinox, measured in the plane of the equator.

mean; → Greenwich Meridian; → sidereal; → time.

Greenwich Meridian
  نیمروزان ِ گرینویچ   
nimruzân-e Greenwich

Fr.: méridien de Greenwich   

The → prime meridian that separates east from west in the same way that the Equator separates north from south. It is defined by the position of the → Airy transit circle.

A borough in southeast London, England, on the Thames River. It is the site of the original Royal Observatory, through which passes the prime meridian, or longitude 0°; → meridian.

Greenwich sidereal date
  روز ِ اختری ِ گرینویچ   
ruz-e axtari-ye Greenwich

Fr.: jour sidéeal de Greenwich   

The number and fraction of → mean sidereal days elapsed on the → Greenwich meridian since 12h January 1, 4773 BC (mean sidereal).

Greenwich meridian; → sidereal; → date.

Greenwich sidereal day number
  شماره‌ی ِ روز ِ اختری ِ گرینویچ   
šomâre-ye ruz-e axtari-ye Greenwich

Fr.: nombre du jour sidéral de Greenwich   

The integral part of the → Greenwich sidereal date.

Greenwich; → sidereal; → day; → number.

Gregorian calendar
  گاهشمار ِ گرگوری   
gâhšomâr-e Gregori (#)

Fr.: calendrier grégorien   

A → solar calendar in which the year length is assumed to be 365.2425 solar days. It is now used as the civil calendar in most countries. The Gregorian calendar is a revision of the → Julian calendar instituted in a papal bull by Pope Gregory XIII in 1582. The reason for the calendar change was to correct for drift in the dates of significant religious observations (primarily Easter) and to prevent further drift in the dates.

Named after Pope Gregory XIII (1502-1585), an Italian, born Ugo Boncompagni, Pope from 1572 to 1585, who ordered the reform of the Julian calendar; → calendar.

Gregorian telescope
  دوربین ِ گرگوری، تلسکوپ ِ ~   
durbin-e Gregori, teleskop-e ~ (#)

Fr.: télescope de Gregory   

A reflecting telescope in which the light rays are reflected from the primary mirror to a concave secondary mirror, from which the light is reflected back to the primary mirror and through the central hole behind the primary mirror. Compare with the → Cassegrain telescope, in which the secondary mirror is convex.

Named after the Scottish mathematician and astronomer James Gregory (1638-1675), who devised the telescope, but did not succeed in constructing it; → telescope.

Greisen-Zatsepin-Kuzmin limit (GZK)
  حد ِ گریسن-زاتسپین-کوزمین   
hadd-e Greisen-Zatsepin-Kuzmin

Fr.: limite de Greisen-Zatsepin-Kuzmin   

A theoretical limit of approximately 6 × 1019  → electron-volts for the energy of → cosmic rays above which they would lose energy in their interaction with the → cosmic microwave radiation background photons. Cosmic ray protons with these energies produce → pions on blackbody photons via the Δ resonance according to: γCMB + p → p + π0, or γCMB + p → n + π+, thereby losing a large fraction of their energy. These interactions would reduce the energy of the cosmic rays to below the GZK limit. Due to this phenomenon, → Ultra-high-energy cosmic rays are absorbed within about 50 Mpc.

Named after Kenneth Greisen (1966), Physical Review Letters 16, 748 and Georgiy Zatsepin & Vadim Kuzmin (1966), Journal of Experimental and Theoretical Physics Letters 4, 78; → limit.

grid
  شباک   
šabâk (#)

Fr.: grille   

1) A → grating of crossed bars; gridiron.
2) A → network of → horizontal and → perpendicular lines, uniformly spaced, for locating points on a map, chart, or aerial photograph by means of a system of coordinates.
3) Electricity: i) A metallic framework employed in a storage cell or battery for conducting the electric current and supporting the active material.
ii) A system of electrical distribution serving a large area, especially by means of high-tension lines.

Shortening of gridiron "a utensil consisting of parallel metal bars on which to broil meat or other food," from M.E. griderne, from gridel, from O.Fr. gredil, gridil, from L. craticula "gridiron, small griddle," diminutive of cratis "wickerwork."

Šabâk, from Laki šowâk "a net woven from goat fleece used for carrying chaff or fruits like melon," variants šâvâk (Lori), šavak (Nahâvand).

grinding
  سابش   
sâbeš

Fr.: ébauchage   

A first step in making a telescope mirror, which consists of rubbing the glass blank with hard tools (glass, tile, or metal) and abrasive grit to produce a concave form. → figuring; → polishing.

Grinding, verbal noun of grind, from O.E. grindan, forgrindan "destroy by crushing," from P.Gmc. *grindanan (cf. Du. grenden), from PIE *ghrendh- "crushing" (cf. L. frendere "to crush, grind;" Gk. khondros "granule, groats").

Sâbeš, verbal noun of sâbidan, variants sâyidan, pasâvidan "to touch" (Khotanese sauy- "to rub;" Sogdian ps'w- "to touch;" Proto-Iranian *sau- "to rub").

gripe
  گله   
gelé (#)

Fr.: doléance   

A minor → complaint.

M.E. gripen, from O.E. gripan; cognate with Du. grijpen, Ger. griefen.

Gelé, → complain.

grism
  گریسم   
grism (#)

Fr.: grism   

An optical dispersing device used in a spectrograph. It is a combination of a prism and a grating, in the sense that the grating is placed side by side to one surface of a small-angle prism.

Grism, from gr(ating) + (pr)ism.

grit
  شن   
šen (#)

Fr.: grain abrasif   

Abrasive particles or granules, classified into predetermined sizes, typically of Silicon Carbide or Aluminum Oxide, used between the mirror and tile tool to grind the glass.

Grit, from O.E. greot "sand, dust, earth, gravel," from P.Gmc. *greutan "tiny particles of crushed rock" (cf. O.S. griot; O.N. grjot "rock, stone;" Ger. Grieß "grit, sand"); PIE base *ghreu- "to rub, pound, crush."

Šen "sand, grit."

groin
  کشال، کشاله   
kašâl (#), kašâlé (#)

Fr.: aine   

Anatomy: The depression on either side of the front of the body between the thigh and the abdomen.

M.E. grynde "groin," originally "depression in the ground," from O.E. grynde "abyss," perhaps also "depression, hollow," related to → ground.

Kašâl, kašâlé, literally "side, edge, margin," cf. Dari Kermâni kašâr, Kermâni kešâl "side, edge," from kašidan "to draw, pull, trace, trail," → galaxy.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>