Fr.: raie aurorale
1) A prominent → forbidden line in the spectra of
the aurora at wavelengths of 5577 and 6300 Å giving the aurora its characteristic green and
Both are emitted by atomic oxygen, the former in its transition from the
second lowest excited electronic state (1S) to the lowest
excited electronic state (1D), the latter in its transition
from the lowest excited electronic state (1D) to the atomic
ground state (3P).
Fr.: zone aurorale
A roughly circular band around either geomagnetic pole above which there is a maximum of auroral activity. It lies about 10 to 15° of geomagnetic latitude from the geomagnetic poles.
1) To establish as genuine.
From L.L. authenticus, from Gk. authentikos "original, primary, at first hand," from authent(es) "one who does things himself," from aut-, from autos "self, one's own," of unknown origin, + -hentes "doer" + -ikos, → ics.
Râstin "genuine, authentic," from râst "right, true; just, straight"
(Mid.Pers. râst "true, straight, direct;" 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;"
Ger. recht; E. right;
PIE base *reg- "move in a straight line," hence, "to direct, rule")
+ -in adj. suffix.
Computers: The process by which a user's identity is checked within the network to ensure that the user has access to the requested resources.
Verbal noun of → authenticate.
1) The writer of a book, article, or other text. One who practices
writing as a profession.
M.E. auctour, from O.Fr. autor, from L. auctor, "creator, enlarger, founder, master, leader," literally "one who causes to grow," from auctus, p.p. of augere "to increase," from PIE root aug- "to increase".
Dâtâr, from Mid.Pers. dâtâr/dâdâr "creator," from Av. and O.Pers. dâtâr "creator," from dâ- "to create, make, appoint," Skt. dhatr "author, creator, preserver, bearer." The Mod.Pers. form of this word in classical literary works is dâdâr, used mainly as noun or adjective for "God, the creator."
1) The power to determine, adjudicate, or otherwise settle issues or
disputes; jurisdiction; the right to control, command, or determine (Dictionary.com).
Dâtârgân, from dâtâr, → author, + -gân, on the model of xodâygân "a great lord."
1) The act, fact, or occupation of writing.
Fr.: auto-, aut-
Gk., from autos "self, one's own," of unknown origin.
Xod-, from xod "self," Av. hva- "self, own."
1) In radio astronomy, a process performed by an → autocorrelator.
Autocorrelation, from → auto- "self" + → correlation.
Xod-hambâzâneš, from xod- "self" + hambâzâneš, → correlation.
Fr.: fonction d'autocorrélation
A mathematical function that describes the correlation between two values of the same variable at different points in time.
In radio astronomy, a spectrograph which correlates the signal with itself with various time delays, and extracts the frequency spectrum of the signal. → correlator.
xodrâhbar, râhbar-e xodkâr
An electronic equipment used to automatically guide a telescope during long exposures.
Autoguider from → auto- "self" + guider, from O.Fr. guider "to guide, lead, conduct," from Germanic origin; akin to O.E. wltan "to look after" witan "to know," akin to O.H.G. wizzan "to know," L. videre "to see," Gk. eidenai "to know," idein "to see," Av. vaêd- "to know," Skt. veda "knowledge; finding."
Xodrâhbar from xod-, → auto + râhbar "guide," from râh "way" + bar, from bordan "to lead."
xodrâhbord, râhbord-e xodkâr
The act or process of guiding a telescope automatically.
Having a self-acting or self-regulating mechanism.
From Gk. automatos "self-acting," from → auto- + matos "willing," from PIE *men- "to think;" compare with Av./O.Pers. man- "to think."
Xodkâr from xod-, → auto-, + kâr "acting, actor," from kardan "to do, act."
automatic photometric telescope
durbin-e šidsanjik-e xodkâr, teleskop-e ~ ~
Fr.: télescope photométrique automatique
A telescope developed to perform photometric observations automatically.
1) Self-governing; independent; subject to its own laws only; having autonomy.
Adjective from → autonomy.
1) Independence or freedom, as of the will or one's actions.
O.Fr., from L. autumnus, a word probably of Etruscan origin.
Pâyiz, from Mid.Pers. pâdiz or pâtez, from Proto-Iranian *pâti-z(a)ya- "near winter," from pâti "near" + *z(a)ya- "winter," compare with Av. zyan- or zyam- "winter" (Skt. heman, Gk. xeimon, L. hiems).
Fr.: équinoxe d'automne
One of the two points where the → ecliptic crosses the → celestial equator. At the autumnal equinox the Sun appears to be moving across the equator from the northern celestial hemisphere to the southern celestial hemisphere. The instant of the event.