Alpheratz (α Andromedae)
The brightest star in → Andromeda with a visual magnitude of 2.07. Alpheratz is a blue → subgiant star of spectral type B8 IV lying at a distance of about 97 → light-years. It is particularly remarkable because of the unusual strength of mercury and manganese absorption lines in its spectrum.
Other names for this star are Alpherat, Sirrah, or Sirah.
These names derive from Ar. As-Surrat al-Faras
1) By this or that time; previously; prior to or at some specified or
From M.E. al redy, literally "fully ready," → all, + M.E. redy "ready," from rædig, from O.E. ræde "prompt" + -ig "-y."
Pišnun, literally "prior to now," from piš-, → pre-, + Mid./Mod.Pers. nun "now, at present" (variants aknun, konun, ultimately from Proto-Ir. *hak-nun); Av. nū- "now," nūrəm "now;" O.Pers. nūram "now;" cf. Skt. nú- "now, just, but," nūnám "now, at present, indeed;" Gk. nun "now;" L. nu- "now" (in nu-dis "the day after tomorrow"); Goth. nu "now;" O.E. nu; E. now; PIE base *nu- "now."
Altair (α Aquilae)
Tâyer, Nasr-e Tâyer, Karkas-e Parandé (#)
The brightest star in → Aquila (apparent visual magnitude 0.77), and the twelfth brightest star in the sky. Altair is a whitish A7 → main sequence star. It has one of the fastest known rotational speeds, 242 km/s at the equator, compared with the Sun's about 2 km/s.
Altair, from Ar. An Nasr at-Taiir "The Flying Vulture," from Nasr "vulture" + Ta'ir "flying."
Karkas-e Parandé "The Flying Vulture" coined by Biruni (around A.D. 1000), from karkas "vulture," Av. kahrkâsa- "devourer hen," from *kahrka "hen" (Mod.Pers. kark "hen," karak "quail") + *âsa "to eat" (Mod.Pers. âš "food, soup") + Parandé "flying," from paridan "to fly" (from Mid./Mod.Pers. par(r) "feather, wing," Av. parəna- "feather, wing;" cp. Skt. parna "feather," E. fern; PIE *porno- "feather").
1) A → mounting for → telescopes
that permits both → vertical and
→ horizontal → rotation.
Altazimuth, from alt(itude) + → azimuth.
altazimuth coordinate system
râžmân-e hamârâhâ-ye farâzâ-sugân
Fr.: coordonnées azimutales
The coordinate system in which the position of a body on the → celestial sphere is described with respect to an observer's → celestial horizon and → zenith. The coordinates of a point in this system are its → altitude on the → vertical circle, and its → azimuth westward (clockwise) along the celestial horizon from the observer's south. Same as → horizon coordinate system.
Fr.: instrument altazimutal
Fr.: monture altazimutale
degargun kardan, degunidan
(v.tr.) To change or make different.
M.E. alteren, from O.Fr. altérer, from M.L. alterre, from L. alter "other," from PIE *al- "beyond" + comp. suffix -ter.
1) The act or process of altering; the state of being altered.
Verbal noun of → alter.
1) peyvâr; 2) peyvâr šodan; 3) peyvâr kardan, peyvâridan
Fr.: 1) alterné; 2, 3) alterner
1) Happening or following in turns; succeeding each other continuously.
From L. alternus "one after the other," p.p. of alternare "to do first one thing, then the other," from alternus "every other," from alter "the other".
1) Peyvâr from pey "step; after" (as in peyâpey
"successively, repeatedly") + Pers. vâr "turn (succession),
time (repetition), alternation". Compare with Skt. vâra
"one's turn, appointed time, alteration, succession".
Occuring in a successive manner. Acting or proceeding by turns. → alternating current.
alternating current (AC)
Fr.: courant alternatif
An → electric current that reverses direction of flow at regular intervals. The typical alternating current is → sinusoidal in shape. Alternating current has the advantage over → direct current in that its → voltage magnitude can be changed easily through a → transformer. Moreover, it is safer to transfer over the longer city distances and can provide more → power. The frequency of alternating current is 50 Hz (Europe) or 60 Hz (USA).
General: Successive change from one thing or state to
another and back again.
Alternation, noun from → alternate.
Alternative, from → alternate.
Degargozin, from degar "other" + gozin "choice." Degar, variant digar, from Mid.Pers. dit, ditikar "the other, the second," O.Pers. duvitiya- "second," Av. daibitya-, bitya- "second," Skt. dvitiya- "second," PIE *duitiio- "second." Gozin, present tense stem of gozidan "to choose," from Mid.Pers. vicitan "to choose," Av. vicidyâi (infinitive) "to discern," viciθa- "separation, discernment," from vi- "aparat, asunder, away from" + kay- "to choose;" cf. Skt. cinoti, cayati.
kâruž-e degargozin, enerži-ye ~
Fr.: énergie alternative
Energy from a source other than the conventional fossil fuel sources.
Fr.: hypothèse alternative
In place of, or as an alternative to.
Adverb from → alternative.
A machine or device that produces alternating current.
farâzsanj (#), farâzyâb (#)
An instrument which determines the altitude of an object with respect to a fixed level, such as sea level.
L. altus "high" + → -meter.
Farâzsanj, from farâz "above, over, aloft" + -sanj, → -meter; farâzyâb, from farâz + yâb "finder," from yâbidan "to find, discover, obtain."
farâzsanji (#), farâzyâbi (#)
The measurement of heights in the atmosphere (altitude) by an → altimeter.