what is the astronomical meaning of the term isotropic?
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"What do ""homogeneity"" and ""isotropy"" mean?  (Intermediate)" Can you please give me the definitions of homogeneity and isotropy in astronomy terms? This is a good question, because these concepts are a bit subtle. Homogeneous is defined as the same in all locations while isotropic means the same in all directions. Imagine that the whole universe is an infinitely large field with one perfectly symmetrical hill, which you are seated atop. Look around: you see an isotropic universe, since the hill is equally green and equally steep in all directions. But the universe is not homogeneous: it has a hill! These concepts are important because most modern cosmology is based on the cosmological principle, the assumption that, on large scales, the universe is both homogeneous and isotropic.
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Definitions &Translations Fractional anisotropy. Fractional anisotropy is a scalar value between zero and one that describes the degree of anisotropy of a diffusion process. A value of zero means that diffusion is isotropic, i.e. it is unrestricted in all directions.
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Subtropics The tropics have been historically defined as lying between the Tropic of Cancer and Tropic of Capricorn, located at 23.45° north and south latitude respectively. The poleward fringe of the subtropics is located at approximately 40° north and south latitude respectively.
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- Under the assumption that the universe is homogeneous and isotropic, the curvature of the observable universe, or the local geometry, is described by one of the three primitive geometries (in mathematics these are called the model geometries): 1  3-dimensional Flat Euclidean geometry, generally notated as E3.
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Ecliptic Earth's orbit, and hence, the ecliptic, is inclined a little more than 1° to the invariable plane, and the other major planets are also within about 6° of it. Because of this, most Solar System bodies appear very close to the ecliptic in the sky. The ecliptic is well defined by the motion of the Sun.
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isobar i·so·bar. 1  a line on a map connecting points having equal barometric pressure at a given reference altitude, commonly sea level, over a given period or at a given time. 2  any atom that has the same atomic weight (or mass number) as another atom but a different atomic number (Ex.: carbon-14 and nitrogen-14)
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- The prefix tropo-denoting turning, a change, is derived from the Greek word tropos, a turning. The troposphere is the lowest level of atmosphere in which the temperature fall … s as height increases.ropo-comes from the Greek tropos which means turning.. Meso-comes from the Greek mesos which means middle.. Thermo-comes from the Greek thermos which means hot.. Exo- … comes from the Greek exō which means outside..
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Axial tilt Earth 's orbital plane is known as the ecliptic plane, and Earth's tilt is known to astronomers as the obliquity of the ecliptic, being the angle between the ecliptic and the celestial equator on the celestial sphere. It is denoted by the Greek letter ε.t an obliquity of zero, these lines point in the same direction i.e. the rotational axis is perpendicular to the orbital plane. Axial tilt differs from inclination. Because the planet Venus has an axial tilt of 177° its rotation can be considered retrograde, opposite that of most of the other planets.
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Space Terms Azimuth definition, Astronomy, Navigation. the arc of the horizon measured clockwise from the south point, in astronomy, or from the north point, in navigation, to the point where a vertical circle through a given heavenly body intersects the horizon. See more.
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Spectrophotometry In astronomy, the term spectrophotometry refers to the measurement of the spectrum of a celestial object in which the flux scale of the spectrum is calibrated as a function of wavelength, usually by comparison with an observation of a spectrophotometric standard star, and corrected for the absorption of light by the Earth's atmosphere.
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- The case for anthropogenic global warming necessarily rests upon the presumptions that (1) the sun is an isotropic and isochronous radiator, and (2) that the energy density of space, filled with electromagnetic radiation across the entire electromagnetic spectrum from trillions of cosmic radiators, is a constant.
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Rottweiler Temperament: What's Good About 'Em, What's Bad About 'Em 1 The reality is that sharp dogs aren't protective -- they're simply over-aggressive, which makes them more likely to attack an innocent person, child, or another animal. 2  If you want a good family dog, you do not want an aggressive Rottweiler.
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Astronomical seeing Astronomical seeing. 1  Schematic diagram illustrating how optical wavefronts from a distant star may be perturbed by a layer of turbulent mixing in the atmosphere. The vertical scale of the wavefronts plotted is highly exaggerated. Astronomical seeing refers to the blurring and twinkling of astronomical objects like stars due to turbulent mixing in the Earth's atmosphere, causing variations of the optical refractive index.
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What is isotropic material explain with example? exists and is an alternate of . An isotropic material is one which looks the same in every direction. We cannot define any special direction using the material properties. In other words, none of the properties depend the orientation; it is perfectly rotationally symmetric. Note that in order to be isotropic the material must be homogenous on the length scale of interest, ie the same at every point in the material.
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isometric Define isometric: of, relating to, or characterized by equality of measure; especially : relating to or being a crystallographic system characterized… of, relating to, or characterized by equality of measure; especially : relating to or being a crystallographic system characterized by three…
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Equator In astronomy, the celestial equator is the great circle in which the plane of the terrestrial Equator intersects the celestial sphere; it consequently is equidistant from the celestial poles. When the Sun lies in its plane, day and night are everywhere of equal length, a twice-per-year occurrence known as equinox.
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Definitions &Translations Definitions for isometric projection. Here are all the possible meanings and translations of the word isometric projection. Freebase(0.00 / 0 votes)Rate this definition: Isometric projection is a method for visually representing three-dimensional objects in two dimensions in technical and engineering drawings.
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azimuth Astronomy, Navigation. the arc of the horizon measured clockwise from the south point, in astronomy, or from the north point, in navigation, to the point where a vertical circle through a given heavenly body intersects the horizon.
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Celestial sphere The celestial sphere is divided by the celestial equator. In astronomy and navigation, the celestial sphere is an imaginary sphere (ball) of a very large unspecified size. The sphere is concentric with the Earth. This means that the celestial sphere and the earth have the same centre. They also rotate upon the same axis.
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anisotropic anisotropic. 1. having unlike properties in different directions. 2. doubly refracting, or having a double polarizing power. 3. in cardiac physiology, having nonuniform conduction; used to describe the nonuniform characteristics of the myocardium in the direction perpendicular to the conduction direction of a fiber. See also isotropic.
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Ecliptic The ecliptic is the year-long path of the Sun against the background of fixed stars. Different. The celestial equator is a projection of the earth's equator, and is inclined to the path of the sun (the ecliptic) by 23.5 degrees. The ecliptic is important because where the Sun travels, the planets follow.
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What is âPeak Horsepowerâ? Years ago, the vacuum cleaner people tried this with peak and developed horsepower in their ads until some government agency accused them of misleading ads. Now they advertise “amps” as an indication of size (this is completely misleading too since a poorly designed motor will consume more amps).
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MEASURING THE SKY The perpendiculars to the ecliptic plane define the ecliptic poles. The North Ecliptic Pole (NEP) is in Draco, the South Ecliptic Pole (SEP) in Dorado. The Earth's axis is tilted relative to the perpendiculars to the ecliptic plane by an angle of 23.5° (actually closer to 23.4°).
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Ecliptic The ecliptic is the circular path on the celestial sphere that the Sun appears to follow over the course of a year; it is the basis of the ecliptic coordinate system. The term also refers to the plane of this path, which is coplanar with Earth's orbit around the Sun (and hence the Sun's apparent orbit around Earth).
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What is the ecliptic? Now, because the ecliptic plane and the equatorial plane have a 23.5 degree angle between them, when you look at star maps of the night sky, you'll see that they usually give preference to the equator, after all our most important line on the surface of the earth, to be drawn as a horizontal straight reference line.
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Celestial Equator Celestial equator-the imaginary line encircling the sky midway between the two celestial poles. Celestial poles-the imaginary points on the sky where Earth 's rotation axis, extended infinitely, would touch the imaginary celestial sphere ...t's anchored to the celestial poles and the ~ (directly above Earth 's equator). Declination and right ascension are the celestial equivalents of latitude and longitude. Declination-Similar to latitude on the Earth 's surface. The distance in degrees north or south of the ~ (similar to the Earth 's Equator).