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celestial longitude

(λ) A coordinate that gives the angular position of a celestial body around the plane of the ecliptic as seen from the Earth; also known as ecliptic longitude. It is measured in degrees ...

celestial longitude

celestial longitude   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

... longitude ( symbol λ ‎ ) A coordinate that gives the angular position of a celestial body around the plane of the ecliptic as seen from the Earth; also known as ecliptic longitude . It is measured in degrees anticlockwise from 0° to 360° along the ecliptic, starting at the vernal...

celestial longitude

celestial longitude noun   Quick reference

New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
38 words
celestial longitude

celestial longitude noun   Quick reference

Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
42 words
celestial longitude

celestial longitude  

(λ) A coordinate that gives the angular position of a celestial body around the plane of the ecliptic as seen from the Earth; also known as ecliptic longitude. It is measured in degrees anticlockwise ...
longitude of perigee

longitude of perigee  

For the Moon or an artificial Earth satellite, the angle measured from the direction of the vernal equinox eastwards along the celestial equator to the ascending node of the satellite's orbit, and ...
ecliptic coordinates

ecliptic coordinates  

A system of coordinates that specifies the position of an object in the Solar System relative to the plane of the Earth's orbit, the ecliptic. Ecliptic coordinates of objects as they would be seen ...
longitude

longitude  

Reference type:
Overview Page
The angle around some reference plane from an adopted starting-point. In astronomy, the equivalent of longitude on Earth is right ascension. See also celestial longitude; galactic longitude; ...
equatorial coordinates

equatorial coordinates  

A system of coordinates that specifies the position of a celestial object relative to the celestial equator. The equatorial coordinate system is most commonly used for giving positions on the ...
right ascension

right ascension  

(α) A coordinate on the celestial sphere, the equivalent of longitude on Earth. Right ascension is measured anticlockwise around the celestial equator, usually in hours, minutes, and seconds of ...
annual equation

annual equation  

A periodic disturbance in the celestial longitude of the Moon, resulting from the changing gravitational pull of the Sun around the Earth's elliptical orbit; also known as annual inequality. It has ...
new Moon

new Moon  

The phase of the Moon when none of its illuminated side is visible from the Earth. At new Moon, the Moon has the same celestial longitude as the Sun.
variation

variation  

1 A periodic disturbance in the Moon's celestial longitude caused by changes in the Sun's gravitational attraction as the Moon orbits the Earth. It has an amplitude of 40′ and a period of half a ...
chronometer

chronometer  

Reference type:
Overview Page
Subject:
History
A timepiece with a nearly constant rate, intended primarily for the determination of longitude by comparing local time, computed by celestial or satellite navigation, with time at the prime meridian ...
ascending node

ascending node  

The point in an orbit at which a body moves from south to north across a reference plane, such as the plane of the ecliptic or of the celestial equator. The longitude of the ascending node is one of ...
armillary sphere

armillary sphere  

Reference type:
Overview Page
Subject:
History
An instrument used since ancient times to demonstrate and observe the movements of the heavens. It consists of a number of rings (armillaries) representing celestial great circles such as the ...
celestial sphere

celestial sphere  

The imaginary sphere, centred on the observer, on which all celestial bodies such as the Sun, Moon, and stars appear to be located. The positions of certain atmospheric optical phenomena are often ...
elements of an orbit

elements of an orbit  

Six parameters that can be used to define the path of a celestial body. The shape of the orbit is defined by its eccentricity (see conic) and semimajor axis. The orientation of the orbit is specified ...
Greenwich hour angle

Greenwich hour angle  

The hour angle of a celestial object as seen by an observer on the Greenwich meridian. GHA is a global standard. The hour angle for any other observer is simply GHA + λ, where λ is the observer's ...
inequality

inequality  

A variation in the movement of a celestial object in its orbit about another which cannot be accounted for by their mutual gravitational attraction. Inequalities usually arise because of the ...
conjunction

conjunction  

The alignment of two celestial bodies within the solar system so that they have the same longitude as seen from the earth. A planet that orbits between the sun and the earth (Venus and Mercury) is in ...

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