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HorizonFrom LoveToKnow 1911 HORIZON (Gr. 6piTcov, dividing), the apparent circle around which the sky and earth seem to meet.
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HorizonRelated Category: Astronomy: General in astronomy, roughly circular line bounding an observer's view of the surface of the earth where the sky and earth seem to meet. This is the visible horizon.
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horizonHome ... Science and Technology Astronomy and Space Exploration Astronomy: General ... Essential reading Compare side-by-side A Dictionary of Astronomy The Oxford Pocket Dictionary ... The Columbia Encyclopedia, ...
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Duffett-Smith, P. " Horizon Coordinates," " Equatorial to Horizon Coordinate Conversion," and " Horizon to Equatorial Coordinate Conversion." §17, 25, and 26 in Cambridge, England: Cambridge University Press, p. 26, 36-37, and 38-39, 1992.
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New Horizons at JupiterFollow NASA's New Horizons mission as it whisks past Jupiter. Your are not currently logged in. To view this page you must be a subscriber to Astronomy magazine.
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Event horizonFrom Memory Alpha, the free Star Trek reference. Jump to: navigation, search ...
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Definition: event horizon: The distance from a black hole within which nothing can escape. In addition, nothing can prevent a particle from hitting the singularity in a very short amount of proper time once it has entered the horizon.
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The cosmic particle horizon is related to the age of the Universe. Its size certainly grows, but with the age of the Universe, not with the expansion of the Universe. As the expansion slows, we certainly would see more in the future than in the past.
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Horizontal plane In astronomy, geography, geometry and related sciences and contexts, a Plane is said to be horizontal at a given point if it is locally perpendicular to the gradient of the Gravitation Field , i.e.
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If you are standing atop a mountain 1 km high, h = 1 km and your horizon should be 112.88 km away (we neglect the refraction of light in the atmosphere, which may modify this value).
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When the Moon is nestled along the horizon, however, we see it surrounded by a foreground of familiar Earth-bound objects -- trees, buildings, or distant landmarks.
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The horizon problem results from the premise that information cannot travel faster than light, and hence two regions of space which are expanding at faster than the speed of light relative to each other cannot communicate.
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Horizontal contrasts of temperature were measured by Voyager in two broad altitude ranges, one located in the range of 60 to 200 millibars and the other of 500 to 1,000 millibars.
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horizon problem One of two conceptual problems with the standard Big Bang model, which is that some regions of the universe which have very similar properties are too far apart to have exchanged information in the age of the universe.
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horizon ~ system: {or alt azimuth system} [a,A] or [ALT,AZ] the simplest celestial co-ordinate system, it is based on altitude and azimuth. It is fundamental in navigation as well as in terrestrial surveying.
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Horizon -- The line marking the apparent junction of Earth and sky. For the technical definition, please follow this link to the U.S. Naval Observatory's Astronomical Applications. h -- Hour, 60 minutes of time.
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horizon -- the line separating the sky from the ground. See also cosmic horizon.
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Horizon Problem(a) A quandary in standard big bang theory, which indicates that few of the particles of the early universe would have had time to be in causal contact with one another at the outset of cosmic expansion.
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Horizons also play a role for other kinds of solutions. In an expanding universe, some regions of the past can be unobservable ("particle horizon"), and some regions of the future cannot by any means be influenced ( event horizon); in both cases, ...
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The horizon size at the last- scattering surface, important not only for big questions of causal connectivity but in the growth of perturbations, is 184 (W h²) -1/2 Mpc.
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The horizon is the plane which defines the half of the sky that you can see. Altitude is the angle between the object you are looking at and your horizon.
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The horizon problem is solved by inflation because regions that appear to be isolated from each other were in contact with each other before the inflation period. They came into equilibrium before inflation expanded them far away from each other.
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event horizonThe radius that a spherical mass must be compressed to in order to transform it into a black hole, or the radius at which time and space switch responsibilities.
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EVENT HORIZONThe event horizon is the radius from a inside of which it is impossible to escape (a "point of no return" called the ). It is also the radius at which a mass must be compressed down to in order to turn it into a black hole.
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Azimuth Horizontal co-ordinate of an object's position in the sky. Derived by drawing an imaginary vertical line from the object to the horizon below. The position is then expressed in degrees east from the north point.
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Pour son horizon. L'astronomie est la science avec les plus grands horizons, pleine de nouvelles technologies. L'astronomie est un attrait pour un jeune (6 ans et plus), plein d'excitement. Des découvertes importantes sont faites annuellement.
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Over Eros' Horizon This incredible picture of Eros, taken on February 14, 2000, shows the view looking from one end of the asteroid across the gouge on its underside and toward the opposite end.
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* Given a true horizon, as at sea, the center of the Sun on the equinox should set twelve hours after it rises -- at least in theory.
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As Venus sunk below horizon, it was dark enough to located star field of the first target - (in)famous M74.
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the angle along the horizon measured eastward from due north to the point on the horizon directly below an object B bolide ...
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M-display (NASA SP-7, 1965) In radar, a display in which target distance is determined by moving an adjustable blip along the baseline until it coincides with the horizontal position of the target signal deflections.
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Much more accurate and detailed data is available from JPL's Horizons telnet interface or the Solar System Dynamics Web site How to compute planetary positions, by Paul Schlyter Tutorial on computing planetary positions, by Paul Schlyter ...
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In temperate northern summers, Scorpius glides above the southern horizon, its lower curved tail almost out of sight, while in the temperate southern winter, the constellation passes high overhead.
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On the variations of the daily mean horizontal force of the Earth's magnetism produced by the sun's rotation and the moon's synodical and tropical revolutions, Philos. Trans. R. Soc. London, 166, 387-404, 1876. Chernosky, E. J.
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Although comets can be present in any region of the sky, they are often discovered near the western horizon after sunset or near the eastern horizon before sunrise, since they are brightest when closest to the Sun.
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The moon rises and sets every day, appearing on the horizon just like the sun. The time depends on the phase of the moon.
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Start by going outside about 10 pm, and looking ten degrees north of east, and 76 1/2 degrees above the horizon. This is very high above the horizon. Remember, straight above your head (the zenith) is 90 degrees above the horizon.
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 See also: Earth, Light, Time, Sun, Planet
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