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Small glassy bodies whose chemical composition is unrelated to the geological formation in which they are found. They are found mostly in Australia, Java, Philippines and Indochina. Tektites are now thought to have been produced by the impact of meteorites on the earth's surface.
From Gk. tekt(os) "molten" + -ite a suffix used in the name of minerals and fossils.
A combining form meaning "distant."
From Gk. tele-, combining form of tele "far off, afar, at or to a distance," related to teleos "end, goal, result, perfection."
Dur- "far," from Mid.Pers. dūr "far, distant, remote;" O.Pers. dūra- "far (in time or space)," dūraiy "afar, far away, far and wide;" Av. dūra-, dūirē "far," from dav- "to move away;" cf. Skt. dūrá- "far; distance (in space and time);" PIE base *deu- "to move forward, pass;" cf. Gk. den "for a long time," deros "lasting long."
The science and technology of measurement and transmission of data by optical, acoustical, or radioelectric means from remote sources, as from space vehicles, to receiving stations for recording and analysis.
durbin (#), teleskop (#)
An instrument used to collect and amplify light or other energy. → Refracting telescopes gather light by means of a lens, → reflecting telescopes by means of a mirror. → Radiotelescopes gather radio energy by using an antenna. Telescopes have also been built that can gather X rays, gamma rays, and other forms of energy. → grazing incidence telescope.
From It. telescopio (used by Galileo, 1611), and Mod.L. telescopium (used by Kepler, 1613), both from Gk. teleskopos "far-seeing," from → tele- "far" + -skopos "seeing," from skopein "to watch, look, behold;" → -scope.
gonbad-e durbin (#), ~ teleskop (#)
Fr.: coupole de télescope
A covering, usually hemispherical, that is rotatable about a central axis. There is a slit opening along one side wide enough to allow a telescope to be directed at any vertical angle up to 90°.
telescope pointing accuracy
rašmandi-ye âmâješ-e durbin, ~ ~ teleskvp
Fr.: précision du pointage de télescope
The accuracy with which a telescope can be pointed to a particular coordinate in the sky.
The Telescope. An inconspicuous constellation situated in the southern hemisphere, at 19h right ascension, 50° south declination. Abbreviation: Tel; genitive: Telescopii.
Telescopium was named by Abbé Nicolas Louis de Lacaille (1713-1762); → telescope.
The tenth of Saturn's known satellites. It is irregularly-shaped and has a diameter of 29 x 22 x 20 km. Telesto orbits Saturn at a distance of 294,660 km. Telesto is co-orbital with Tethys, residing in Tethys' leading Lagrangian point (L4). The images taken by the Cassini probe during its distant flyby on October 11, 2005 show that its surface is surprisingly smooth, devoid of small impact craters. Telesto was discovered by B. Smith, H. Reitsema, S. Larson, J. Fountain in 1980 from ground-based observations.
In Gk. mythology Telesto was a daughter of Oceanus and Tethys.
1) Pertaining to the Earth, as a planet, or the earth or soil.
From L. tellur-, from tellus "earth" + → -ic.
Zamini, of or pertaining to zamin, → earth.
Fr.: bande tellurique
A band seen in the spectra of celestial objects, which is due to absorption by gases such as oxygen, water vapor, and carbon dioxide in the Earth's atmosphere
A brittle metallic element usually found in combination with → gold and other → metals, used to → alloy stainless → steel and → lead, and, as bismuth telluride, in thermoelectric devices; symbol Te. → Atomic number 52; → atomic weight 127.60; → melting point 450°C; → boiling point 990°C; → specific gravity 6.24 at 20°C. It was discovered by the Roumanian mine director Franz Joseph Muller von Reichenstein in 1782 and overlooked for sixteen years until it was first isolated by German chemist Martin-Heinrich Klaproth in 1798. The Hungarian chemist Paul Kitaibel independently discovered tellurium in 1789, prior to Klaproth's work but after von Reichenstein.
From L. tellur-, from tellus "earth" + -ium a L. suffix occurring in the name of some chemical elements.
A → periodic comet that is the progenitor of the → Leonids meteor shower. It has a period of 33 years, a → perihelion of 0.982 → astronomical units, an → eccentricity of 0.904, and an → inclination of 162.7°. It was first discovered in 1865 though its past appearances have been traced back to 1366. Tempel-Tuttle is estimated to have a nucleus of radius 1.8 km and a mass of 1.2 × 1013 kg. Also designated 55P/Tempel-Tuttle.
Named after the German astronomer Ernst Wilhelm Tempel (1821-1889) and the American astronomer Horace Parnell Tuttle (1837-1923), who independently discovered the comet on December 19, 1865 and January 6, 1866 respectively.
A physical quantity characterizing the mean random motion of molecules in a physical body. In other words, a measure of the average kinetic energy of the particles of a system.
From L. temperatura "a tempering, moderation," from temperatus, p.p. of temperare "to moderate, to mix." Sense of "degree of heat or cold" first recorded 1670 (Boyle), from L. temperatura, used in this sense by Galileo.
Damâ, from dam "breath of an owen; bellows; smoke; air," also "moment, time," from Mid./Mod.Pers. damidan "to blow, breathe;" Av. dāδmainya- "blowing up;" cf. Skt. dahm- "to blow," dhámati "blows;" Gk. themeros "austere, dark-looking;" Lith. dumti "to blow;" PIE dhem-/dhemə- "to smoke, to blow."
nâhamsângardi-ye damâ (#), nâ-izogardi-ye ~
Fr.: anisotropie de température
Cosmology: Minute temperature variations of the cosmic microwave background radiation.
zine-ye damâ (#)
Fr.: gradient de température
A physical quantity that describes the rate of change of temperature with displacement in a given direction from a given reference point. Same as → thermal gradient.
Fr.: inversion de température
Meteo.: A reversal in the normal temperature decrease, the temperature rising with increased elevation in the atmosphere instead of falling. A layer in which temperature increases with altitude.
An elementary unit of time defined as the duration which is necessary for light to travel a distance equal to the classical radius of an electron. Thus, one tempon (τ) is equal to (e2/mc2)(1/c)≅ 10-23 seconds.
From tamp, from L. tempus "time" + → -on.
tâmeni; 1) zamâni; 2) in-jahâni; 3) tâmeni; 4) giyâni; 5) zamâni
1) Of or pertaining to time.
M.E., from O.Fr., from L. temporalis "of a time, but for a time, temporary," from tempus (genitive temporis) "time, season, proper time or season," of unknown origin.
Tâmeni, from tâmen, → time.
Fr.: cohérence temporelle
A measure of the correlation between the phases of an → electromagnetic wave at different points along the direction of propagation. Temporal coherence indicates to what extent a source is monochromatic. Imagine a source emitting waves with wavelength λ ± Δλ. Waves with wavelength λ and λ + Δλ, which at some point in space constructively interfere, will no longer constructively interfere after some path length lc = λ2/(2πΔλ); lc is called the → coherence length.
Fr.: heure temporelle
A unit of time used in the Roman and Ottoman empires that divided the day from sunrise to sunset into 12 equal numbers of hours, resulting in long summer hours and short winter hours.