﻿ right ascension

# right ascension

Ascension (α, R, A - English:. Right Ascension) - celestial equator arc size from the vernal equinox to the declination circle luminary. Ascension - one of the second coordinate system equatorial (there is also one in which is used a clockwise angle). The second coordinate -. Declination
ascension is measured eastward from the vernal equinox. To measure the RA-degree or measure is used (from 0 ° to 360 °), or measure hour (from 0h to 24h). . Thus 24h = 360 °
ascension - astronomical equivalent terrestrial longitude second equatorial system. And the right ascension and longitude measured angle "east-west" along the equator; Both measures take the count from the zero point on the equator. The origin of longitude on the Earth - the prime meridian; the beginning of the Right Ascension on the sky -. the vernal equinox
physical meaning of the RA is that if the local real high point of the observer is the right ascension of light, it is at the top of the climax - the highest, that is the most convenient possible for of the place of observation point of the celestial sphere.
History
concept of right ascension was known in the days of Giparha that identifies the location of stars in the equatorial coordinates in the II century BC But Giparh and his successors were their catalogs of stars in ekliptychnay coordinate system.
With the invention of the telescope was possible to observe celestial objects in greater detail. In order to keep the object in view for a long time, it is convenient to use an equatorial mount, which allows the telescope rotates around the polar axis. In this regard, and it was decided the equatorial coordinate system.
first star catalog in which to determine the coordinates of objects used by right ascension and declination, was Historia Coelestis Britannica, John Flamsteed.
Right ascension and declination visualized

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Celestial mechanics
Newton's laws | The law of gravity | Kepler's laws | Two-body problem | Three-body problem | The gravitational N-body problem | Bertrand | Kepler's equation

celestial sphere celestial coordinate system: • horizontal • galactic equatorial first second equatorial • • ekliptychaya | International Celestial Reference System | The spherical coordinate system | That is the world | The Celestial Equator | Right ascension | Declination | ecliptic | equinox | solstice | The fundamental parameters of the orbit plane

Kepleravy orbital elements: eccentricity of the semi-major axis • • • mean anomaly of ascending node longitude • perytsentra argument | Apatsentr and perytsentr | Orbital speed | orbital node | Epoch

movement of celestial bodies
movement of the sun and planets on the celestial sphere | Efemerydy | Configurations of the planets: the confrontation • Area • parade of planets | the culmination | Sidereal period | Orbital resonance | The rotation period | Advance equinoxes | Synodic period | convergence | Eclipse: eclipse lunar eclipse • • • Saras metonym cycle | coating | flow | Libratsyya | Elangatsyya | The effect of code | Effect Yarkovskiy | Zhanibekava effect
Spaceflight
escape velocity: the first (circular) • Two (parabolic) • • Third quarter |
Tsiolkovsky rocket equation | Gravity assist | Gomanavskaya trajectory | Method askulyuyuchyh elements | Tidal acceleration | orbit inclination change | dock | Lagrange Points | The effect of "Pioneer»
orbits of satellites into geostationary orbit
| Heliocentric orbit | Geosynchronous orbit | Geocentric orbit | Geaperahodnaya orbit | Low carrier orbit | Polar orbit | Tundra-orbit | Sun-synchronous orbit | Lightning-orbit |

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