angle Comparison Table

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angle comparison table

Subject has definition has symbol is a component of see also has elongation has synonym is requir has acronym is a kind of is an instance of

angular size The angle subtended by an object on the sky. For example, the angular size of the moon is 30 arcminutes. angle

argument of the perihelion Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point. ω osculating element longitude of the perihelion to define the size, shape, and orientation of an orbit in space angle

azimuth Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith. local coordinate angle

blaze angle The tilt of the facets or grooves of a diffraction grating. angle

Bragg angle Glancing angle between an incident X-ray beam and a given set of crystal planes for which the secondary X-radiation from the planes combines to give a single reflected beam. angle

celestial latitude Angular distance on the celestial sphere measured north or south of the ecliptic along the great circle passing through the poles of the ecliptic and the celestial object. ecliptic coordinate angle

celestial longitude Angular distance on the celestial sphere measured eastward along the ecliptic from the dynamical equinox to the great circle passing through the poles of the ecliptic and the celestial object. ecliptic coordinate angle

declination Angular distance north (+) or south (-) of the celestial equator to some object, measured in degrees, minutes, and seconds of arc along an hour circle passing through the object. Declination is analogous to latitude on the Earth's surface. δ equatorial coordinate angle

elevation The angular distance of a celestial body above or below the horizon, measured along the great circle passing through the body and the zenith. Elevation is 90 deg. minus zenith distance. local coordinate altitude angle

elongation angle

galactic latitude The angle between the line of sight to a star and the Galactic plane. Galactic latitude ranges from +90 degrees to -90 degrees; the Galactic plane has a Galactic latitude of 0 degrees. Regions north of the Galactic plane have positive Galactic latitude; regions south have negative Galactic latitude. The point with a Galactic latitude of +90 degrees is called the north Galactic pole, and the point with a Galactic latitude of -90 degrees is called the south Galactic pole. astronomical coordinate angle

galactic longitude A measure of a star's position with respect to the Sun and Galactic center. Galactic longitude ranges from 0 degrees to 360 degrees. Imagine the Sun at the center of a giant clock, with the Galactic center located in the direction of six o'clock. A Galactic longitude of 0 degrees would correspond to the direction of six o'clock, a Galactic longitude of 90 degrees to the direction of three o'clock, a Galactic longitude of 180 degrees to the direction of twelve o'clock, and a Galactic longitude of 270 degrees to the direction of nine o'clock. astronomical coordinate angle

half-power beamwidth The angle across the main lobe of an antenna pattern between the two directions where the sensitivity of the antenna is half the value at the center of the lobe. This is the nominal resolving power of the antenna system. HPBW angle

inclination The angle between two planes or their poles; usually the angle between an orbital plane and a reference plane. i osculating element to define the size, shape, and orientation of an orbit in space angle

longitude of the ascending node An orbital element representing the point where the body crosses the ecliptic from south to north Ω osculating element to define the size, shape, and orientation of an orbit in space angle

parallax The difference in apparent direction of an object as seen from two different locations; conversely, the angle at the object that is subtended by the line joining two designated points. Geocentric (diurnal) parallax is the difference in direction between a topocentric observation and a hypothetical geocentric observation. Heliocentric or annual parallax is the difference between hypothetical geocentric and heliocentric observations; it is the angle subtended at the observed object by the semi-major axis of the Earth's orbit. First trigonometric parallax was obtained in 1838. (eee also horizontal parallax.) distance angle

phase angle The angle measured at the center of an illuminated body between the light source and the observer. angle

pitch angle Angle specifying the direction of electron velocity; or the angle between a tangent to a spiral arm and the perpendicular to the direction of the galactic center. angle

right ascension Angular distance on the celestial sphere measured eastward along the celestial equator from the equinox to the hour circle passing through the celestial object. Right ascension is usually given in combination with declination. α equatorial coordinate angle

terrestrial latitude Angular distance on the Earth measured north or south of the equator along the meridian of a geographic location. geocentric coordinate angle

terrestrial longitude Angular distance measured along the Earth's equator from the Greenwich meridian to the meridian of a geographic location. geocentric coordinate angle

zenith distance Angular distance on the celestial sphere measured along the great circle from the zenith to the celestial object. Zenith distance is 90� minus altitude. local coordinate angle

Next quantity: angular momentum Up: quantity Previous quantity: velocity

Subject	has definition	has symbol	is a component of	see also	has elongation	has synonym	is requir	has acronym	is a kind of	is an instance of
angular size	The angle subtended by an object on the sky. For example, the angular size of the moon is 30 arcminutes.								angle
argument of the perihelion	Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.	ω		osculating element		longitude of the perihelion	to define the size, shape, and orientation of an orbit in space			angle
azimuth	Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith.		local coordinate							angle
blaze angle	The tilt of the facets or grooves of a diffraction grating.								angle
Bragg angle	Glancing angle between an incident X-ray beam and a given set of crystal planes for which the secondary X-radiation from the planes combines to give a single reflected beam.								angle
celestial latitude	Angular distance on the celestial sphere measured north or south of the ecliptic along the great circle passing through the poles of the ecliptic and the celestial object.		ecliptic coordinate							angle
celestial longitude	Angular distance on the celestial sphere measured eastward along the ecliptic from the dynamical equinox to the great circle passing through the poles of the ecliptic and the celestial object.		ecliptic coordinate							angle
declination	Angular distance north (+) or south (-) of the celestial equator to some object, measured in degrees, minutes, and seconds of arc along an hour circle passing through the object. Declination is analogous to latitude on the Earth's surface.	δ	equatorial coordinate							angle
elevation	The angular distance of a celestial body above or below the horizon, measured along the great circle passing through the body and the zenith. Elevation is 90 deg. minus zenith distance.		local coordinate			altitude				angle
elongation									angle
galactic latitude	The angle between the line of sight to a star and the Galactic plane. Galactic latitude ranges from +90 degrees to -90 degrees; the Galactic plane has a Galactic latitude of 0 degrees. Regions north of the Galactic plane have positive Galactic latitude; regions south have negative Galactic latitude. The point with a Galactic latitude of +90 degrees is called the north Galactic pole, and the point with a Galactic latitude of -90 degrees is called the south Galactic pole.		astronomical coordinate							angle
galactic longitude	A measure of a star's position with respect to the Sun and Galactic center. Galactic longitude ranges from 0 degrees to 360 degrees. Imagine the Sun at the center of a giant clock, with the Galactic center located in the direction of six o'clock. A Galactic longitude of 0 degrees would correspond to the direction of six o'clock, a Galactic longitude of 90 degrees to the direction of three o'clock, a Galactic longitude of 180 degrees to the direction of twelve o'clock, and a Galactic longitude of 270 degrees to the direction of nine o'clock.		astronomical coordinate							angle
half-power beamwidth	The angle across the main lobe of an antenna pattern between the two directions where the sensitivity of the antenna is half the value at the center of the lobe. This is the nominal resolving power of the antenna system.							HPBW	angle
inclination	The angle between two planes or their poles; usually the angle between an orbital plane and a reference plane.	i		osculating element			to define the size, shape, and orientation of an orbit in space			angle
longitude of the ascending node	An orbital element representing the point where the body crosses the ecliptic from south to north	Ω		osculating element			to define the size, shape, and orientation of an orbit in space			angle
parallax	The difference in apparent direction of an object as seen from two different locations; conversely, the angle at the object that is subtended by the line joining two designated points. Geocentric (diurnal) parallax is the difference in direction between a topocentric observation and a hypothetical geocentric observation. Heliocentric or annual parallax is the difference between hypothetical geocentric and heliocentric observations; it is the angle subtended at the observed object by the semi-major axis of the Earth's orbit. First trigonometric parallax was obtained in 1838. (eee also horizontal parallax.)					distance			angle
phase angle	The angle measured at the center of an illuminated body between the light source and the observer.								angle
pitch angle	Angle specifying the direction of electron velocity; or the angle between a tangent to a spiral arm and the perpendicular to the direction of the galactic center.								angle
right ascension	Angular distance on the celestial sphere measured eastward along the celestial equator from the equinox to the hour circle passing through the celestial object. Right ascension is usually given in combination with declination.	α	equatorial coordinate							angle
terrestrial latitude	Angular distance on the Earth measured north or south of the equator along the meridian of a geographic location.		geocentric coordinate							angle
terrestrial longitude	Angular distance measured along the Earth's equator from the Greenwich meridian to the meridian of a geographic location.		geocentric coordinate							angle
zenith distance	Angular distance on the celestial sphere measured along the great circle from the zenith to the celestial object. Zenith distance is 90� minus altitude.		local coordinate							angle