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: 12948 Search : far
eclipse magnitude
  برز ِ خورگرفت   
borz-e xorgereft

Fr.: grandeur de l'éclipse, magnitude ~ ~   

The fraction of the Sun's diameter occulted by the Moon. It is strictly a ratio of diameters and should not be confused with → eclipse obscuration, which is a measure of the Sun's surface area occulted by the Moon. Eclipse magnitude may be expressed as either a percentage or a decimal fraction (e.g., 50% or 0.50). By convention, its value is given at the instant of → greatest eclipse (F. Espenak, NASA).

eclipse; → magnitude.

eclipse mapping
  نقشه‌برداری ِ گرفتی   
naqše bardâri-ye gerefti

Fr.: cartographie par éclipse   

A method for imaging the continuum light distributions of the → accretion disks of → cataclysmic variable stars. It relies on geometrical information contained in eclipse light curves. An alternative method is → Doppler tomography.

eclipse; → mapping.

eclipse obscuration
  تیره‌شد ِ خورگرفت   
tirešod-e xorgereft

Fr.: obscuration de l'éclipse   

The fraction of the Sun's area occulted by the Moon. It should not be confused with → eclipse magnitude, which is the fraction of the Sun's diameter occulted by the Moon. Eclipse obscuration may be expressed as either a percentage or a decimal fraction (e.g., 50% or 0.50) (F. Espenak, NASA).

eclipse; obscuration, verbal noun from → obscure.

eclipse season
  فصل ِ گرفت   
fasl-e gereft

Fr.: saison d'éclipse   

The period during which the Sun is close enough to one of the → lunar orbit nodes so that an eclipse can take place. This time window lasts for 37 days for → solar eclipses and almost 24 days for → lunar eclipses. These seasons occur every 173.31 days. Two eclipse seasons make up an → eclipse year.

eclipse; → season.

eclipse year
  سال ِ گرفتی   
sâl-e gerefti

Fr.: année des éclipses   

The interval of time (346.620 03 days) between two successive passages of the Sun through the same node of the Moon's orbit. It takes less than a solar year to complete an eclipse year because the Moon's orbit and the lunar nodes are slowly regressing.

eclipse; → year.

eclipsing binary
  دورین ِ گرفتی   
dorin-e gerefti

Fr.: binaire à éclipses   

A binary star in which one of the two stars passes in front of the other so that the system's total light periodically fades. The most famous eclipsing binary is → Algol.

eclipse; → binary.

eclipsing variable
  ورتنده‌ی ِ گرفتی   
vartande-ye gerefti

Fr.: variable à éclipses   

Same as → eclipsing binary.

eclipse; → variable.

ecliptic
  هورپه   
hurpeh

Fr.: écliptique   

The Sun's apparent path in the sky relative to the stars in the course of a year. It is also the projection of the Earth's orbital plane onto the → celestial sphere. Because of the inclination of the → Earth's rotation axis, the ecliptic is tilted by about 23.4° with respect to the → celestial equator, an angle known as the → obliquity of the ecliptic. The ecliptic crosses the celestial equator at the → equinoxes.

From L. ecliptica linea "path of eclipses," so called because eclipses happen only when the Moon is near this path, from eclipsis, → eclipse.

Hurpeh "sun path," from hur "sun," variant xor, cognate with Gk. helios, → Sun, + peh "path, way," from O.Pers. paθi- "path, way;" Av. paθ-, variants paθi-, paθā-, pantay-; Mid/Mod.Pers. pand "path, advice, councel;" Khotanese pande "road, path;" Ossetic fœndœg "path, road;" cf. Skt. pánthā- "road, path, course;" Gk. patos "path, way;" L. pons "bridge, path;" E. find; PIE base *pent- "to go, to tread."

ecliptic latitude
  ورونای ِ هورپهی   
varunâ-ye hurpehi

Fr.: latitude écliptique   

One of the two coordinates in the → ecliptic system; the angle measured from the ecliptic, positive toward the north.

ecliptic; → latitude.

ecliptic longitude
  درژنای ِ هورپهی   
derežnâ-ye hurpehi

Fr.: longitude écliptique   

One of the two coordinates in the → ecliptic system; the angle measured eastwards along the ecliptic from 0° to 360°, with the origin at the → vernal equinox.

ecliptic; → longitude.

ecliptic plane
  هامن هورپهی   
hâmon-e hurpehi

Fr.: plan de l'écliptique   

The plane of Earth's orbit around the Sun.

ecliptic, → plane.

Ecliptic Plane Input Catalogue (EPIC)
  کاتالوگ ِ درداد ِ هامن ِ هورپهی   
kâtâlog-e dardâdâ-e hâmon-e hurpehi

Fr.: catalogue d'entrée du plan de l'écliptique   

A catalog of fields along the → ecliptic observed by the → K2 mission. The catalog is hosted at the → Mikulski Archive for Space Telescopes (MAST).

ecliptic; → plane; → input; → catalogue.

ecliptic pole
  قطب ِ هورپهی   
qotb-e hurpehi

Fr.: pole de l'écliptique   

Either of the two points on the celestial sphere that are 90° above and below the plane of ecliptic. The north ecliptic pole lies in → Draco, and the south ecliptic pole in → Dorado. Due to → precession, the → celestial pole moves in a circle around the ecliptic poles once every 25,800 years.

ecliptic, → pole.

ecliptic system
  راژمان ِ هورپهی   
râžmân-e hurpehi

Fr.: système écliptique   

Coordinate system with the ecliptic as the fundamental plane.

ecliptic; → system.

eco-
  بوم-   
bum- (#)

Fr.: éco-   

A combining form meaning "house, household, environment, nature, natural habitat."

Ultimately from Gk. oikos "house," cognate with L. villa "country house, farm," related to vicus "village, group of houses; " cf. Av. vis- "homestead, community;" O.Pers. viθ- "house, royal house, farm;" Mid.Pers. wis "village;" dialectal Pers. wiš-, vīš- "to set (of Sun)," wīs- "to enter" (Cheung 2007); Skt. viś- "settlement, house, tribe, people;" Goth. weihs "village;" Lith. viešpats "master of the house;" PIE *ueik'- "to settle (down)."

Bum-, from bum "region, land, a mansion or place where one dwells in saftey; nature, disposition;" Mid.Pers. bûm "land, earth, country;" O.Pers. būmi- "place of being/living, land, region;" Av. būmī- "earth," from bav- "to be, become, take place;" cf. Skt. bhūmi- "land, region;" PIE *bheu- "to be, come into being, become" (cf. Gk. phu- "become," phuein "to bring forth, make grow;" L. fui "I was" (perf. tense of esse), futurus "that is to be, future;" Ger. present first and second person sing. bin, bist; E. to be; O.Ir. bi'u "I am;" Lith. bu'ti "to be;" Rus. byt' "to be").

ecology
  بوم‌شناسی   
bumšenâsi (#)

Fr.: écologie   

1) The scientific discipline that is concerned with the relationships between living organisms and their past, present, and future environments.
2) The study of the damaging effects of modern civilisation on the environment, with the aim of prevention or reversal through conservation.

eco- + → -logy.

economic
  بومداتی   
bumdâti

Fr.: économique   

1) Pertaining to the production, distribution, and use of income, wealth, and commodities.
2) Of or relating to the science of economics.
3) Pertaining to an economy, or system of organization or operation, especially of the process of production (Dictionary.com).

Adjective, from → economics.

economic growth
  رست ِ بومداتی   
rost-e bumdâti

Fr.: croissance économique   

An increase in the output that an economy produces over a period of time.

economic; → growth.

economical
  بومداتی   
bumdâti

Fr.: économique   

1) Avoiding waste or extravagance; thrifty.
2) → economic.

economic; → -al.

economics
  بومداتیک   
bumdâtik

Fr.: économie   

The science that deals with description and analysis of the production, distribution, and consumption of goods and services.

From L. oeconomicus "well ordered," from Gk. oikonomikos "practiced in the management of a household or family," from oikonomia, from oiko- "house," → eco-, + -nomia "rule, law," → -nomy; + → -ics.

Bum, → eco- + -dât, → -nomy, + -ik, → -ics.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>