Equatorial Coordinate System
This is the preferred coordinate system to pinpoint objects on the celestial sphere.
Equatorial Coordinate System
Related Category: Astronomy: General
the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celestial sphere.
Equatorial mount
An Equatorial Mount for a telescope.
An equatorial mount is a mount used for moving a telescope or camera along two perpendicular axes of motion. These two axes are known as right ascension and declination.
Equatorial Mounting
Related Category: Astronomy: General
see telescope.
More on Equatorial Mounting
Telescope - traditionally, a system of lenses, mirrors, or both, used to gather light from a distant object and form an image of it.
equatorial coordinate system
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Equatorial coordinate system
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Equatorial coordinates are fixed on the celestial sphere, following the daily rotation of the Earth and its yearly revolution about the Sun.
Equatorial Coordinates
The consisting of (or ; the angle between an object's longitude and the measured eastward along the ) and (the angle above or below the , from to -90°).
Equatorial Coordinate System
In the equatorial system, the Earth's equator and poles are projected outward into space to form a celestial sphere with the Earth at the center.
Equatorial Disadvantages
Good Equatorial mountings tend to be bulky and heavy, making them less portable than some altazimuth designs (often have to be broken down into many smaller components for transport).
equatorial mount
a telescope mount in which one axis lies parallel to Earth's rotational axis; the motion of the telescope about this axis can compensate for Earth's rotation
equinox ...
Equatorial A mounting for a telescope that has two, mutually perpendicular axes of rotation, one of which can be pointed to the north celestial pole.
equatorial ~: [α, δ] or [RA, DEC] is the most common astronomical co-ordinate system and is defined by the celestial equator and poles. The right ascension and declination are directly analogous to terrestrial latitude and longitude.
Equatorial Co-ordinates A system of celestial co-ordinates that uses the celestial equator as the reference plane and the First Point of Aries as the reference direction. The co-ordinates are given as Right Ascension (RA) and Declination (Dec).
Equator -- An imaginary circle around a body which is everywhere equidistant from the poles, defining the boundary between the northern and southern hemispheres.
equatorial mount
A telescope mount which is aligned to the celestial pole, so that one axis moves the telescope in right ascension and the other moves it in declination. An equatorial mount easily tracks the movement of the sky.
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Equatorial Mounting
A telescope mounting that allows motion parallel to and perpendicular to the celestial equator.
Ergosphere ...
Equatorium
The Equatorium was an analog computer invented by AbÅ" IshÄq IbrÄhÄ"m al-ZarqÄlÄ" (Arzachel) in al-Andalus, probably around 1015 CE.
Equatorial electrojet
The worldwide solar-driven wind results in the so-called Sq (solar quiet) current system in the E region of the Earth's ionosphere (100-130 km altitude).
Equator, celestial. The projection of the Earth's equator onto the celestial sphere.
Equator - The line around the surface of a rotating body that is midway between the rotational poles. The equator divides the body into northern and southern hemispheres ...
Equator
The great circle on the surface of a body formed by the intersection of the surface with the plane passing through the center of the body perpendicular to the axis of rotation. (see Celestial Equator.) [S92]
Equatorial Mount ...
Equatorial axis -- Among the two mutually perpendicular axes of a telescope, the one that points at the celestial pole. To keep a star in view, the telescope must be rotated around this axis at the same rate as the Earth turns.
Equatorial Mounts
Because the earth spins, the stars and planets move in the heavens above us. Tracking a star while viewing it requires constant repositioning of the telescope to compensate for the motion of the earth.
Equatorial radius (Earth = 1)2.8222e-03
Mean density (gm/cm^3)3.1
Mean distance from Jupiter (km)23,700,000 ...
Equator An imaginary line around the center of a body where every point on the line is an equal distance from the poles. The equator defines the boundary between the northern and southern hemispheres.
Extragalactic Outside our galaxy.
F ...
Equatorial Mount
The equatorial mount is the most common type of mount available with today's telescopes. It is pretty much standard with both reflectors and refractors. This mount consists of two perpendicular axes.
Equator
The line that passes around the middle of the Earth.
Equatorial Diameter ...
equatorial mount - A mounting for a telescope, one axis of which is parallel to the earth's axis, so that a motion of the telescope about the axis can compensate for the earth's rotation.
faculus (pl. faculae) - Bright region near the limb of the sun.
Equatorial Mount
A telescope mount that has two axes of movement. One axis is pointed at the North or South Celestial Pole, depending on the latitude of the observer, and permits east-to-west travel.
EQUATORIAL TELESCOPE MOUNT
An equatorial telescope mount is a complex device that is aligned parallel to Earth's axis and is pivoted at a right angle in order to follow the apparent motion of celestial objects (caused by the Earth's spinning).
Equatorial System.
Latitudinal Co-ordinate; Declination or Polar Distance. Longitudinal " Right Ascension.
Ecliptic System.
equator - (n.)
(a) Of the earth, a great circle on the earth, midway between the poles; (b) Celestial, the projection of the earth's equator onto the celestial sphere.
equatorial coordinates - (n.) ...
"Equatorial" isn't as specific a definition as circumpolar and you will hear the word "equatorial" used to refer to anything that is in line with or near the Equator.
The equatorial diameter of Saturn, 120,536 kilometres, is measured with respect to the one-bar pressure level in its atmosphere, for Saturn has no solid surface in its outer layers.
The equator is a make-believe line around the center of Earth. Mapmakers use the line to divide Earth into two halves. The northern half is called the Northern Hemisphere. The southern half is called the Southern Hemisphere.
The equatorial region of the planet Venus shows evidence of massive electrical scarring, matching the patterns of spidery filaments seen in high-energy plasma discharge.
The equatorward drift of average sunspot latitudes. [H76]
Spontaneous Emission ...
A dark equatorial lens-shaped band was revealed in Voyager observations of Tethys, which is also very prominent in the new Cassini maps, but the real surprise was that a similar feature was also seen on Mimas, ...
Name Equatorial Diameter (km) Oblateness Mass (Earth=1) Rotation Period Tilt (degrees)
Mercury
4878
0.0 ...
Saturn's equator is tilted relative to its orbit by 27° - similar to Earth's 23.4° axial tilt - which causes the seasons. Thus, as Saturn orbits the sun, it tilts its hemispheres towards Earth in a changing manner.
The huge equatorial bulge on Mars is greatly affected by the Sun's gravitational attraction. The Jet Propulsion Laboratory estimates that Mars' axis tilt changes from 15° to 30° over a period of millions of years.
celestial equator
The imaginiary line around the sky directly above the Earth's equator.
celestial pole (north or south) ...
celestial equator The projection of the Earth's equator onto the celestial sphere.
celestial sphere Imaginary sphere surrounding the Earth, to which all objects in the sky were once considered to be attached.
The first equatorial mounting, in which one axis, called the polar axis, is parallel to the axis of the earth, is ascribed to the British astronomer William Lassell (1799-1880).
CELESTIAL EQUATOR
The celestial equator is the projection of the Earth's equator onto the celestial sphere.
CELESTIAL POLES
The celestial poles are the projection of the Earth's poles onto the celestial sphere.
Galactic equator The great circle along the line of the Milky Way, marking the central plane of our galaxy.
Galaxy A large disk or ball of billions of stars and nebulae. They are the largest individual structures in the Universe.
Celestial equator
the intersection of the earth's equatorial plane with the celestial sphere.
Celestial pole
the north and south celestial poles are points on the celestial sphere where earths axis of rotation intersects the celestial sphere.
Celestial equator: An imaginary great circle in the sky drawn concentric to the Earth's equator.
The celestial equatorial plane and the ecliptic currently intersect in Pisces, not far from the border with Aquarius, and in Virgo, not far from the border with Leo.
The celestial equator runs just north of the Belt of Orion, just south of Pisces and just north of Libra, right around the celestial globe.
Similar to the equator on Earth, we have the celestial equator on the celestial sphere. The ecliptic will intersect the equator with an angle 23.5°. The two intersection points are the vernal equinox and autumnal equinox.
At the Earth's equator, the Sun's declination has no effect on the length of daylight. There, you pretty much have 12 hours of daylight and 12 hours of night all year long. The Rite of Spring ...
equator (NASA Thesaurus / NASA SP-7, 1965) The primary great circle of a sphere or spheroid, such as the earth, perpendicular to the polar axis; or a line resembling or approximating such a circle.
Mars Statistics Equatorial radius (km)
3,397.2 Equatorial radius (Earth = 1)
5.3264e-01 Mean distance from the Sun (km)
227,940,000 Mean distance from the Sun (Earth = 1)
1.5237 Rotational period (hours)
24.6229 Rotational period (days)
1.
Iapetus's giant equatorial ridge
Cassini's first encounter with Iapetus also revealed another striking feature not seen before: a ridge 13 kilometers higher than the surrounding terrain that extends at least 1300 km almost almost exactly parallel ...
Cassini found an equatorial mountain range twice the height of Mount Everest on the heavily cratered, icy moon Iapetus. Half of Iapetus is coated with dark material while the other half shines white.
People at Earth's equator are moving at a speed of about 1,600 kilometers an hour -- about a thousand miles an hour -- thanks to Earth's rotation. That speed decreases as you go in either direction toward Earth's poles.
25.38 Earth days (equator)
Equatorial Diameter
864,400 miles
1,391,000 km
109 times Earth's diameter ...
Close to the heaven equator lies the faint constellation of Equuleus. It streches roughly from DECL=+13 degrees to DECL=0 degrees and RA=20h 55m to RA=21h 30m. This small size makes it the second smallest constellation in the sky.
 See also: Earth, Sun, Light, Solar, Time
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