right ascension

Definitions

  • WordNet 3.6
    • n right ascension (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere "one hour of right ascension equals fifteen degrees"
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Webster's Revised Unabridged Dictionary
    • right ascension etc., the change in the apparent latitude, longitude, etc., of a heavenly body, due to the effect of atmospheric refraction.
    • Right ascension See under Ascension.
    • Right ascension (Astron) that degree of the equinoctial, counted from the beginning of Aries, which rises with a star, or other celestial body, in a right sphere; or the arc of the equator intercepted between the first point of Aries and that point of the equator that comes to the meridian with the star; -- expressed either in degrees or in time.
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Chambers's Twentieth Century Dictionary
    • Right ascension (astron.) the name applied to one of the arcs which determine the position relatively to the equator of a heavenly body on the celestial sphere, the other being the declinator
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Etymology

Chambers's Twentieth Century Dictionary
L. ascensioascendĕre.

Usage

In literature:

It contains the right ascension, declination, and azimuth index, all neatly carved upon slate.
"Men of Invention and Industry" by Samuel Smiles
ASCENSION, RIGHT, the angular distance of a heavenly body from the first point of Aries, measured on the equator.
"Recreations in Astronomy" by Henry Warren
The hours of right ascension and the degrees of declination are the main things to be noticed.
"Other Worlds" by Garrett P. Serviss
So, our Lord's ascension life at the Father's right hand, finds its echo in the ascension life being lived by His follower on the earth.
"Quiet Talks on Following the Christ" by S. D. Gordon
Right ascension of ditto 250d to 290d variable.
"Outlines of a Mechanical Theory of Storms" by T. Bassnett
Declination about minus twenty, as I remember it, and right ascension between six and seven hours.
"Skylark Three" by Edward Elmer Smith
The third column shows that its right ascension is 6h 40m and its declination -16 deg..
"Lectures on Stellar Statistics" by Carl Vilhelm Ludvig Charlier
Dawn came almost ere we knew it, and again the blue peaks of Ascension loomed up right ahead.
"Rídan The Devil And Other Stories" by Louis Becke
Its right ascension was 0 deg.
"The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler" by David Brewster
CONJUNCTION, in nautical astronomy, is when two bodies have the same longitude or right ascension.
"The Sailor's Word-Book" by William Henry Smyth
Right ascension: zero hours, thirteen minutes.
"Next Door, Next World" by Robert Donald Locke
Now Right Ascension is different from both astronomical and civil time.
"Lectures in Navigation" by Ernest Gallaudet Draper
Thus on the 10 October, at 50 minutes past 5 in the evening the Right ascension of the comet was 163 deg.
"Personal Recollections, from Early Life to Old Age, of Mary Somerville" by Mary Somerville
The right ascension of Capella is 5h.
"A Text-Book of Astronomy" by George C. Comstock
Through Thy glorious Ascension Thou didst deify the flesh which Thou didst assume, and placed it on the throne at the Father's right hand.
"Orthodox Daily Prayers" by Anonymous
Now (Dec. 3) it has south declination of 34 deg., and right ascension of 19h.
"Antigua and the Antiguans, Volume II (of 2)" by Anonymous
First there will be the star's name, and in the next column its magnitude, and in a third the star's right ascension.
"Astronomy" by David Todd
The position of a celestial body is referred to the equator by its right ascension and declination.
"Letters on Astronomy" by Denison Olmsted
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In news:

Why do astronomers use the term right ascension .
With such a broad spectrum of themes — civil rights, the modernization of college sports, Brown v Board of Education, Chamberlain 's ascension, cultural change in Kansas — what will you focus on and how tough will it be to keep a balance.
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In science:

The bottom panel of Figure 6 shows the scatter in BCCD − mZ as a function of right ascension.
On the CCD Calibration of Zwicky galaxy magnitudes & The Properties of Nearby Field Galaxies
In this paper we have presented CCD magnitudes for galaxies around 204 Zwicky galaxies which sample over 400 square degrees, extending 6 hours in right ascension.
On the CCD Calibration of Zwicky galaxy magnitudes & The Properties of Nearby Field Galaxies
The data show no deviation from the expected uniform right ascension distribution.
Physics of Extremely High Energy Cosmic Rays
Hence, the choice of equatorial coordinates is highly convenient, because then no changes of boundaries are necessary in right ascension.
A Remarkable Angular Distribution of the Intermediate Subclass of Gamma-Ray Bursts
Right ascension increases from bottom to top of the frame, declination from left to right.
The Sloan Digital Sky Survey: Technical Summary
APM sequence were investigated as a function of Right Ascension.
The Edinburgh/Durham Southern Galaxy Catalogue - IX. The Galaxy Catalogue
EDSGC right ascension coverage i.e. the EDSGC overlaps with the −39◦ and −42◦ declination strips of the LCRS which span from ≃ 21hrs to ≃ 4hrs in right ascension.
The Edinburgh/Durham Southern Galaxy Catalogue - IX. The Galaxy Catalogue
Both Python V regions are observed with a grid spacing of 0.92◦ in elevation and 2.5◦ in right ascension, in 345 effective fields.
Cosmic Microwave Background Anisotropy Measurement From Python V
Alternative source name where appropriate. c Right ascension and declination (J2000.0).
Sub-Milliarcsecond Imaging of Quasars and Active Galactic Nuclei. II. Additional Sources
Horizontal coordinates are right ascension and vertical coordinates are declination.
Physics and Operation of the AMANDA-II High Energy Neutrino Telescope
Thus, each night of observation we obtain a strip of the sky, which is 2.◦3 wide, and several hours of right ascension long, in four different filter bandpasses.
RR Lyrae Stars in the Halo: Tracers of Streams of Debris of Disrupted Galaxies
Radial plot of the distribution of the RRs in right ascension.
RR Lyrae Stars in the Halo: Tracers of Streams of Debris of Disrupted Galaxies
In Table 1, we list 26 WR stars – as is usual ordered by increasing right ascension – that are either confirmed here with our new spectroscopy, or literature datasets firmly establish their nature.
Gemini observations of Wolf-Rayet Stars in the Local Group Starburst Galaxy IC10
N, F, RA, and De respectively are quantities that represent the columns "Name", "Fν=2695", "Right ascension", and "Declination".
Proposal for a quantity based data model in the Virtual Observatory
A full-time operation of the surface detector means that there is no exposure variation in sideral time and therefore constant exposure in right ascension.
Angular Power Spectrum Estimation of Cosmic Ray Anisotropies with Full or Partial Sky Coverage
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