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: 13116 Search : far
truce
  ناپرد   
nâpard

Fr.: trève   

A suspension of hostilities for a specified period of time by mutual agreement of the warring parties (Dictionary.com).

M.E. triws, trewes, originally plural of trewe "faith, treaty," from O.E. treow "faith, truth, fidelity; promise," cf. O.Frisian triuwe, M.Du. trouwe, Du. trouw, O.H.G. triuwa, Ger. treue "faith, faithfulness." The Germanic word was borrowed into L.L. as tregua, hence Fr. trève.

Nâpard, literally "not war," from negation prefix nâ-, → un-, + pard, variant of vard in prefixed nabard, âvard "fight, struggle," ultimately from Proto-Ir. *part- "to fight, struggle," cf. Av. pərət- "to fight, struggle."

true
  راستین   
râstin (#)

Fr.: vrai   

Being in accordance with the actual state or conditions; e.g. → true anomaly; → true equinox; → true horizon; → true north; → true Sun.

M.E. trewe (adj. and adv.); O.E. triewe, treowe "trustworthy" (cf. O.Fris. triuwi, Du. getrouw, O.H.G. gatriuwu, Ger. treu, O.N. tryggr, Goth. triggws "faithful, trusty").

Râstin, from râst "right, true; just, upright, straight;" Mid.Pers. râst "true, straight, direct;" Soghdian rəšt "right;" O.Pers. rāsta- "straight, true," rās- "to be right, straight, true;" Av. rāz- "to direct, put in line, set," razan- "order;" cf. Skt. raj- "to direct, stretch," rjuyant- "walking straight;" Gk. orektos "stretched out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" M.E.; O.E. reht, riht; cf. O.H.G. reht, Ger. recht, O.N. rettr, Goth. raihts; PIE base *reg- "move in a straight line," hence, "to direct, rule."

true anomaly
  ناسانی ِ راستین   
nâsâni-ye râstin

Fr.: anomalie vraie   

One of the standard → orbital elements, which is the angle measured at the → focus nearest the → periapsis of an elliptical orbit, between the periapsis and the → radius vector from the focus to the orbiting body.

true; → anomaly.

true celestial equator
  هموگار ِ آسمانی ِ راستین   
hamugâr-e âsmâni-ye râstin

Fr.: équateur céleste vrai   

The → celestial equator of date, which is the → great circle on the → celestial sphere perpendicular to the instantaneous axis of rotation of the Earth. Its interaction with the → ecliptic defines the → vernal equinox of date and the → autumnal equinox of date.

true; → celestial; → equator.

true celestial pole
  قطب ِ آسمانی ِ راستین   
qotb-e âsmâni-ye râstin

Fr.: pôle céleste vrai   

The direction of the Earth's instantaneous rotation pole. It differs from the pole due to the short time-scale (days or decades) variations called → nutation.

true; → celestial; → pole.

true equator
  هموگار ِ راستین   
hamugâr-e râstin

Fr.: équateur vrai   

Same as → true celestial equator.

true; → equtor.

true equinox
  هموگان ِ راستین   
hamugân-e râstin

Fr.: équinoxe vrai   

The intersection of the → ecliptic with the → true celestial equator for a given epoch. It is derived from the → mean equinox accounting for the → nutation.

true; → equinox.

true horizon
  افق ِ راستین   
ofoq-e râstin

Fr.: horizon vrai   

A large circle of the → celestial sphere whose plane is perpendicular to the radius of the Earth through the point. Same as → astronomical horizon. The → visible horizon usually lies lower than the true horizon. See also → dip of the horizon.

true; → horizon.

true north
  هودر ِ راستین   
hudar-e râstin

Fr.: nord vrai   

The geographic north defined by the rotational pole of the Earth, as opposed to magnetic north defined by the geomagnetic north pole.

true; → north.

true position
  نهش ِ راستین   
neheš-e râstin

Fr.: position vraie   

The coordinates of an object for a given date, with respect to the true equator and the true equinoxes for the instant of time in question.

true; → position.

true sidereal time
  زمان ِ اختری ِ راستین   
zamân-e axtari-ye râstin

Fr.: temps sidéral vrai   

The → sidereal time with respect to the → true equinox.

true; → sidereal; → time.

true Sun
  خورشید ِ راستین   
xoršid-e râstin

Fr.: Soleil vrai   

The Sun as seen in the sky, also referred to as the → apparent Sun; in opposition to → mean Sun.

true; → Sun.

Trumpler 14
  ترامپلر ۱۴   
Trumpler 14

Fr.: Trumpler 14   

A young → massive star cluster in the → Carina Nebula, lying about 10 arcmin to the north-west of → Trumpler 16. It comprises several → O-type stars. In particular, its core contains at least three very early O-type stars; → HD 93129.

From a catalog by Robert J. Trumpler (1886-1956), the Swiss-American astronomer who studied the → open clusters at Lick Observatory (1930). He was the first to produce a definite evidence of the existence of → interstellar reddening, due to → absorption, and to estimate its magnitude.

Trumpler 16
  ترامپلر ۱۶   
Trumpler 16

Fr.: Trumpler 16   

A → massive star, and the most populous cluster of the → Carina Nebula. It contains several → O-type stars and three known → Wolf-Rayet stars in addition to the famous → LBV star → Eta Carinae. Trumpler 16 is probably older than → Trumpler 14.

Trumpler 14.

truncate
  کل کردن   
kol kardan

Fr.: tronquer   

To shorten by cutting off a part.
Math.: 1) To shorten a number by dropping a digit or digits; e.g. to shorten 3.438 to 3.4.
2) To remove portions of solids falling outside a set of symmetrically placed planes.

From L. truncatus "cut off," p.p. of truncare "to maim, cut off," from truncus "mutilated, cut off."

Kol kardan "to cut off the end of; to dock a tail," from kol "docked, short," variants in a large number of dialects: kola, kalta, kel, kelma, koc, kall, kor, kul in Gilaki, Tâleši, Lori, Malâyeri, Hamedâni, Qâeni, and others, cf. Av. kaurvô- "bald, docked," kaurvôduma- "with a bald tail," kaurvôgaoša- "with bald ears;" cf. Gk. kol(os) "docked" (kolouros "dock-tailed;" L. colurus) + kardan "to do, to make" (Mid.Pers. kardan, O.Pers./Av. kar- "to do, make, build," Av. kərənaoiti "makes," cf. Skt. kr- "to do, to make," krnoti "makes," karma "act, deed;" PIE base kwer- "to do, to make").

truncation
  کل‌کرد، کل‌شد   
kolkard, kolšod

Fr.: troncature   

The act or process of truncating, as → disk truncation.

Verbal noun from → truncate.

truth
  راستینی   
râstini (#)

Fr.: vérité   

1) The quality of being true, genuine, actual, or factual.
2) Something that is → true as opposed to → false.
3) Logic: The correct corresponding of a → proposition with a → fact. See also → truth value, → partial truth.

M.E. treuthe; O.E. trêowth "faith, faithfulness, fidelity; quality of being true," from triewe, treowe "faithful," → tue, with suffix *-itho-th.

Noun from râstin, → true, + noun suffix -i.

truth function
  کریای ِ راستینی   
karyâ-ye râstini

Fr.: fonction de vérité   

A → total function from → truth values to truth values (a sequence of truth values).

truth; → function.

truth table
  جدول ِ راستینی   
jadval-e râstini

Fr.: table de vérité   

A table with columns and rows that lists the resultant → truth value of the given → sentences for each of the possible combinations of truth values to the simple sentences out of which the given sentences are constructed.

truth; → value.

truth value
  ارزش ِ راستینی   
arzeš-e râstini

Fr.: valeur de vérité   

The quality of a logical → proposition (or a formal → symbol) which describes the relation of a proposition to → truth. The traditional → formal logic admits only two contradictory values, → true or → false. In → symbolic logic, more specifically in → polyvalent logics, other truth values are used (such as possible, impossible, undetermined, probable, random, etc.).

truth; → value.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg 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 > >>