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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

<< < -es -iv -ti 21- a p abe abs abs acc acc acc act act ada adi ads aes Age Alb Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app app arc Arg ari art ass ast ast ast atm ato att Aur aut axi azi bac Bal Bar Bar Bay Bec Ber bet bic bij bin bio Bir bla Bla blu blu bol Boo bou bra Bre bro bug C r cal Cal can car Car Cas cat cau 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 Cop Cor cor cor cos cos Cou cou cow cre cri cro cry cur cut Cyg dam dar dat de deb dec dec ded def deg del dem den dep des det dev dia dif dif dig dio Dir dis dis dis dis dis dis div don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ Equ esc eth Eur eve exa exc exe exi exp exp ext ext eye fac fal Far fed fer fer fie fin fir fit fla flo flu fol for for Fou fra fre Fre fro fuz gai Gal Gal gam gas Gau gen gen geo geo geo gia glo gol gra gra gra gra gre gri gui H I hai Ham har Hau hea hec hel hel her HES hie hig his hom hor hot Hub hum Huy hyd hyd hyl hyp ice ide ima imp imp imp inc ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iro irr iso iso ite jel Jou Jup kao Kep kil Kip Kra Lag Lam lan lar las law lea leg Leo lex lig lim lin lin lin lit Loc loc log Lor low lum lun lun Lym mac mag mag mag mag mag mai Mal mar mas mas mat max mea mec meg men mer met met met mic mic Mik min min mis mob mod mol mon moo mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ odd OH Ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai Pan par par par par pas pea pen per per per per Per per pha phl pho pho pho pi pip Pla pla pla pla ple poa pol Pol pol pol pop pos pos pot pra pre pre pre pri pri pri pro pro pro pro pro pro pro Pto pul puz 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 rep res res res res ret Rhe rid rig ris Roe Ros rot rub rut Sag sam sat sca sca Sch sci sea sec sec see sel sem sen ser Sh2 sha shi sho sid sig sim sin Sir ske sli Smo soc sol sol sol sol sol sou spa spa spe spe spe spe sph spi spo Squ sta sta sta sta ste ste ste sto str str str sub sub sub sum sup sup sup sup sur sus sym syn T d tap tec tem ten tes the the the the thi thr tid tim tip ton tor tow tra tra tra tra tri tri tru tub tur two Typ ult un- und uni uni unp upp urg V20 Van var veg vel ver vib vio vir vis Vol Vul wan wat wav WC4 wea wel whi Wil wis WNL wor X-r Yer Z s zer [C > >>

Number of Results: 12982 Search : far
Cassini state
  استات ِ کاسینی   
estât-e Cassini

Fr.: état de Cassini   

A state characterizing a system which obeys → Cassini's laws.

Cassini's law; → state.

Cassini's law
  قانون ِ کاسینی   
qânun-e Cassini

Fr.: loi de Cassini   

Any of the three empirical laws governing the rotational dynamics of the → Moon:
1) The Moon rotates uniformly about its polar axis with a → rotational period equal to the mean → sidereal period of its orbit about the Earth.
2) The → inclination of the Moon's equator to the → ecliptic is a constant angle approximately 1.5°.
3) The → ascending node of the lunar orbit on the ecliptic coincides with the → descending node of the lunar equator on the ecliptic. This law could also be expressed as: the spin axis and the normals to the ecliptic and orbit plane remain coplanar (Noyelles, 2009, Icarus, 202, 225).

Named after Jean-Dominique Cassini (1625-1712), French astronomer of Italian origin, who established these laws in 1693 (Traité de l'origine et du progrès de l'astronomie), ; → law.

Cassini-Huygens
  کاسینی-هویگنس   
Cassini-Huygens

Fr.: Cassini-Huygens   

A joint endeavor of → NASA, → ESA, and the Italian space agency that sent a spacecraft to study the planet → Saturn and its system, including → Saturn's rings and its natural satellites. The spacecraft was 6.70 m × 4 m × 4 m and weighed about 6 tons. Cassini drew its electric power from the heat generated by the decay of 33 kg of → plutonium-238. The spacecraft carried 12 sophisticated observation and measuring instruments. Cassini-Huygens was launched on 15 October 1997. It used several → gravity assist manoeuvres to boost itself toward Saturn. It flew past Venus two times (April 1998 and June 1999), made → flybys of Earth (August 1999), and f Jupiter (December 2000). After 6 years and 8 months, covering about 8 billion km it entered Saturn orbit on July 1, 2004. It stayed there for 13 years and made detailed observations of the planet, its rings, and its moons. A scientific probe called Huygens was released on December 25, 2004 from the main spacecraft to parachute through the atmosphere to the surface of Saturn's largest and most interesting moon, → Titan. The data that Huygens transmitted during its final descent and for 72 minutes from the surface included 350 pictures that showed a shoreline with erosion features and a river delta. Cassini continued to orbit Saturn and complete many flybys of Saturn's moons. A particularly exciting discovery during its mission was that of → geysers of water ice and organic molecules at the south pole of → Enceladus, which erupt from an underground global ocean that could be a possible environment for life. Cassini's radar mapped much of Titan's surface and found large lakes of liquid → methane. Cassini also discovered six new moons and two new rings of Saturn. The mission was ended on September 15, 2017 when the spacecraft was crashed into Saturn's body and destroyed. This was the best way to avoid contaminating Saturn's moons with possible Earth microbes, because the moons may have the potential to support life.

Named after two famous scientists. The Saturn orbiter is named after the Italian/french astronomer Jean-Domenique Cassini, who discovered the Saturnian satellites → Iapetus in 1671, → Rhea in 1672, and both → Tethys and → Dione in 1684. In 1675 he discovered what is known today as the → Cassini division, the narrow gap separating Saturn's rings into two parts. The Titan probe was named Huygens in honor of the Dutch scientist, Christiaan Huygens, who discovered Titan in 1655.

Cassiopeia
  کاسیوپه   
Kâsiopé (#)

Fr.: Cassiopée   

A prominent circumpolar → constellation in the northern sky. Its brightest stars form a distinctive, turning W shape. Abbreviation Cas, genitive form Cassiopeiae.

L. Cassiopea, from Gk. Kassiepeia, Andromeda's mother and king Cepheus of Ethiopia's wife, who boasted about her beauty to the degree that she considered herself more beautiful than the sea-nymphs. The consequences were awful for her daughter → Andromeda.

Castor (α Geminorum)
  کاستور   
Kâstor

Fr.: Castor   

The second brightest star in the → constellation  → Gemini. This star has the identifier "alpha," but it is fainter than β Geminorum (→ Pollux). Castor was known as a main sequence, blue star of magnitude 1.98 and → spectral type A1. However, it is actually a → gravitationally bound family of six stars. The two brightest of the six, Castor A and Castor B, revolve around one another over a period of about 445 years. Castor A, the brighter of the two, is magnitude 1.9, while its companion is 3.0. Castor A is of spectral type A1 V and Castor B is Am. They are hotter than the Sun and about three times more massive, and lie 51 → light-years from Earth. Castor A and B are orbited by a third star called Castor C. It's a 9th magnitude → red dwarf (dMe1) and lies about one arc minute to the south. Castor C is about 1,000 → astronomical units from the bright pair and takes 14,000 years to orbit around them. Each of the three is a → spectroscopic binary making Castor a → sextuplet. Castor C is a → binary star of red dwarf stars a little more than half the size of the Sun. They revolve around one another evry 19 hours. The companions of Castor A and B are also smaller dwarf stars.

In Gk. mythology, Castor and → Pollux were twin heroes called the Dioscuri. Castor was the son of Leda and Tyndareus, Pollux the son of Leda and Zeus. They were great warriors and were noted for their devotion to each other. After Castor was killed by Lynceus, Pollux implored Zeus to allow his brother to share his immortality with him. Zeus created the constellation Gemini in their honor.

cata-
  کتا-، کاتا-، کات-، کت-   
katâ-, kâtâ-, kât-, kat-

Fr.: cata-   

A prefix meaning "down," also "against; back; by, about; with, along," occurring originally  in loanwords from Greek; variants cat- and cath-, as in catalog, cataclysm, cataract, cathode, catastrophe, etc.

From Gk. kata-, before vowels kat-, from kata "down from, down to."

Katâ-, kâtâ-, kât-, kat-, loan from Gk., as above.

cataclysm
  گتلور   
gatlur

Fr.: cataclysme   

1) A devastating flood; deluge.
2) Any violent upheaval that brings about great changes or causes great demolition. See also: → catastrophe.

From Fr. cataclysme, from L. cataclysmos "deluge," from Gk. kataklysmos, from kataklyzein "to inundate," from kata "down" + klyzein "to wash."

Gatlur "great flood," from gat "great, large, big" [Mo'in, Dehxodâ] + lur "flood" [Mo'in, Dehxodâ], cf. Gk. louein "to wash," L. luere "to wash," Bret. laouer "trough," PIE *lou- "to wash." Variants of lur in Pers. dialects are: Lori, Kordi laf, lafow, lafaw, Tabari , all meaning "flood."

cataclysmic
  گتلوری   
gatluri

Fr.: cataclysmique   

1) Of, pertaining to, or resulting from a → cataclysm.
2) Having the effect of, or of the nature of, a cataclysm. → cataclysmic variable.

cataclysm; → -ic.

cataclysmic variable
  ورتنده‌ی ِ گتلوری   
vartande-ye gatluri

Fr.: variable cataclysmique   

A → variable star that shows a sudden and dramatic change in brightness, including → flare stars, → novae, and some types of → symbiotic stars. They are believed to be very → close binary systems consisting of an → accreting → white dwarf  → primary and an evolved → late-type secondary star that has filled its → Roche lobe. For systems with an → accretion disk, it is believed that a thermal instability is the cause of repetitive outbursts observed in cataclysmic variables called → dwarf novae.

cataclysmic; → variable.

catalog
  کاتالوگ   
kâtâlog (#)

Fr.: catalogue   

A list or record of items systematically arranged with descriptive details. → Index Catalogue; → Messier catalog; → New General Catalogue.

M.E. cathaloge, cateloge, from M.Fr. catalogue, from L.L. catalogus, from Gk. katalogos "a list, register," from kata "down, completely" + legein "to say, count," → -logy.

Kâtâlog, loan from Fr., as above.

catalog place
  جای ِ کاتالوگی   
jâ-ye kâtâlogi

Fr.: position catalogue   

Same as catalog position and → mean catalog place.

catalog; → place.

catalog position
  نهش ِ کاتالوگی   
neheš-e kâtâlogi

Fr.: position catalogue   

Same as catalog place and → mean catalog place.

catalog; → position.

catastrophe
  نگونزار   
negunzâr

Fr.: catastrophe   

A great, often sudden calamity; a complete failure; a sudden violent change in the earth's surface. → cataclysm.

From Gk. katastrophe "an overturning, ruin," from katastrephein "to overturn, ruin" from kata "down" + strephein "to turn."

Negunzâr, from negun "overturned, inverted" + -zâr suffix denoting profusion, abundance, as in kârzâr "a field of battle; combat" šurezâr "unfertile, salty ground; nitrous earth," xoškzâr "arid land," and so forth.

catastrophism
  نگونزارباوری   
negunzârbâvari

Fr.: catastrophisme   

The doctrine that certain vast geological changes in the Earth's history were caused by sudden, short-lived, violent events rather than gradual evolutionary processes. Catastrophism explains the differences in → fossil forms encountered in successive → stratigraphic levels. This doctrine is associated with the French naturalist Baron Georges Cuvier (1769-1832). Catastrohism is contrasted to the → uniformitarianism.

catastrophe; → -ism.

categorical
  کتاگری، کتاگریک   
katâgori, katâgorik

Fr.: catégorique   

1) Unambiguously explicit and direct, without exceptions or conditions.
2) Relating to or included in a → category.
3) Logic: Of a → proposition (→ syllogism), consisting of a → subject and a → predicate, each of which denotes a class, and having one of the → Aristotelian forms.

category; → -ic; → -al.

categorical proposition
  گزاره‌ی ِ کتاگریک   
gozâre-ye katâgorik

Fr.: proposition catégorique   

In a → syllogism, a → proposition or statement that deals with inclusion or exclusion of members of → subject classes in → predicate classes. Categorical propositions are of four basic forms, see → Aristotelian form.

categorical; → proposition.

categorical syllogism
  باهمشماری ِ کتاگریک   
bâhamšomâri-ye katâgorik

Fr.: syllogisme catégirique   

A standard → syllogism that consists of three → categorical propositions in which there are three terms, and each term appears exactly twice. The three terms in a standard categorical syllogism are the → major term, → mino term, and → middle term.

categorical; → syllogism.

categorize
  کتاگریدن   
katâgoridan

Fr.: catégorise   

To place in a → category or class.

category; → -ize.

category
  کتاگر   
katâgor

Fr.: catégorie   

1) A group of things that are similar in some way.
2a) Philo.: In Aristotelian logic, any of the ten different ways (substance, quantity, quality, relation, place, time, position, possession, doing, and undergoing) in which the subject of a proposition may relate to its predicate. For example, the proposition "All men are mortal" belongs to the Category of Quality since it tells us what "all men" are like, namely mortal.
2b) Philo.: In Kant's system, any of the twelve (four groups of three each) pure concepts of the understanding that constitute necessary conditions of experience and correspond with the classes of judgements treated in formal logic. According to Kant, the categories are results of the mind's activity, and are distinguished from sensation. The categories have, furthermore, like space and time relations, a peculiar universality. They are, in other words, a priori.
3) Math.: An entity consisting of a class of objects and a class of → morphisms between those objects that satisfy certain properties.

M.Fr. catégorie, from L.L. categoria, from Gk. kategoria, from kategorein "to speak against; to accuse, assert, predicate," from kata "down, against, back," → cata-, + agorein "to speak before public assembly," from agora "marketplace, public square" (from ageirein "to gather"); cognate with L. grex, gregis "herd, troop, crowd;" Skt. gramah- "heap, crowd, community;" Old Icelandic kremja "to squeeze;" O.E. crammian "to cram;" Latvian  gùrste "bundle of flask;" Polish garnac "to gather;" Russ. gorst' "cupped hand;" cf. Pers. gor-, gal-, etc., as below; PIE base *ger- "to gather."

Katâgor, from katâ-, → cata-, + gor- "to gather," ultimately from PIE *ger-, as above. We put forward that the following Iranian words derive from the above PIE base *ger- "to gather":
goruh "crowd, troop, band;"
gallé (conversion of r to l) "herd, flock;"
jarra (Laki) "group; stick bundle;"
gerd in gerd âvardan "to collect, bring together" probably not related to gerd "round, circular;"
xalam (štiyâni) "herd, flock;"
xelima (Qâyeni) "herd;"
korand, korang "a ring made by hunters or troops;"
korka (Laki) "bundle of harvested ears of wheat;"
gola, golé "bundle of hair; bunch"
gola-gâh "place of gathering;"
gurâb "market place in a village, agora;"
There are dozens of villages all-over Iran named Gorâb, Gurâb, Gela, Gola, Gala and their combinations with other words (e.g. Galadeh, Galazan, Galavand) that probably refer to places of gathering.
One can also mention village names such as Agora, Gore, Gere(kalâ), Garaku, Oger, and so on in Mâzandarân;
Khotanese (prefixed ham-) gris "to assemble."

category theory
  نگره‌ی ِ کتاگر   
negare-ye katâgor

Fr.: théorie des catégories   

A theory that deals with the concept of → category and generalizes the → set theory.

category; → theory.

<< < -es -iv -ti 21- a p abe abs abs acc acc acc act act ada adi ads aes Age Alb Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app app arc Arg ari art ass ast ast ast atm ato att Aur aut axi azi bac Bal Bar Bar Bay Bec Ber bet bic bij bin bio Bir bla Bla blu blu bol Boo bou bra Bre bro bug C r cal Cal can car Car Cas cat cau 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 Cop Cor cor cor cos cos Cou cou cow cre cri cro cry cur cut Cyg dam dar dat de deb dec dec ded def deg del dem den dep des det dev dia dif dif dig dio Dir dis dis dis dis dis dis div don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ Equ esc eth Eur eve exa exc exe exi exp exp ext ext eye fac fal Far fed fer fer fie fin fir fit fla flo flu fol for for Fou fra fre Fre fro fuz gai Gal Gal gam gas Gau gen gen geo geo geo gia glo gol gra gra gra gra gre gri gui H I hai Ham har Hau hea hec hel hel her HES hie hig his hom hor hot Hub hum Huy hyd hyd hyl hyp ice ide ima imp imp imp inc ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iro irr iso iso ite jel Jou Jup kao Kep kil Kip Kra Lag Lam lan lar las law lea leg Leo lex lig lim lin lin lin lit Loc loc log Lor low lum lun lun Lym mac mag mag mag mag mag mai Mal mar mas mas mat max mea mec meg men mer met met met mic mic Mik min min mis mob mod mol mon moo mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ odd OH Ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai Pan par par par par pas pea pen per per per per Per per pha phl pho pho pho pi pip Pla pla pla pla ple poa pol Pol pol pol pop pos pos pot pra pre pre pre pri pri pri pro pro pro pro pro pro pro Pto pul puz 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 rep res res res res ret Rhe rid rig ris Roe Ros rot rub rut Sag sam sat sca sca Sch sci sea sec sec see sel sem sen ser Sh2 sha shi sho sid sig sim sin Sir ske sli Smo soc sol sol sol sol sol sou spa spa spe spe spe spe sph spi spo Squ sta sta sta sta ste ste ste sto str str str sub sub sub sum sup sup sup sup sur sus sym syn T d tap tec tem ten tes the the the the thi thr tid tim tip ton tor tow tra tra tra tra tri tri tru tub tur two Typ ult un- und uni uni unp upp urg V20 Van var veg vel ver vib vio vir vis Vol Vul wan wat wav WC4 wea wel whi Wil wis WNL wor X-r Yer Z s zer [C > >>