The difference between magnetic north and geographic (true) north. Surveyors used a compass to determine the direction of survey lines. Compasses point to magnetic north, rather than true north. This declination error is measured in degrees, and can range from a few degrees to ten degrees or more. Surveyors may have been instructed to correct their surveys by a particular declination value. The value of declination at any point on the earth is constantly changing because the location of magnetic north is drifting. More information about historical values of declination is available.
Equatorial mounts have two axis of movement referred to as Declination and Right Ascension. Right Ascension refers to the axis in line with the Earth's axis of rotation, and Declination is the axis 90 degree from Right Ascension. !-- google_ad_client = "pub-5394366782992674"; google_ad_width = 728; google_ad_height = 90; google_ad_format = "728x90_as"; google_ad_type = "text_image"; google_ad_channel =""; google_color_border = "6699CC"; google_color_bg = "003366"; google_color_link = "FFFFFF"; google_color_url = "AECCEB"; google_color_text = "AECCEB";
A coordinate used on the celestial sphere just as latitude is used on Earth. An object's declination is measured in degrees from the celestial equator; positive degrees if north of the equator, and negative if south of the equator. Also see right ascension.
(1) In geometry, for a spherical coordinate system, the angle at the centre of a sphere between the equatorial plane and a line to a point on the sphere. (2) The arc between the Equator and a point on a great circle perpendicular to the Equator. (3) In astronomy, the angular distance of a star or planet above or below the celestial Equator. (4) Magnetic declination is the angle between true (geographic) north and magnetic North (the direction of the magnetic compass needle), from the point of observation. This angle varies for different locations and continually changes with time due to the wandering of the magnetic north pole. (5) Grid declination is the angle between grid north on a grid reference system (e.g. U.T.M. Grid or Military Grid) and true (geographic) north. (In navigation, the term variation is also used).
One of two measurements of the position of an object in the sky. Declination measures in degrees from 0 to 90 the position of a celestial object north or south of the celestial equator, just like latitude measures positions on the Earth north or south of the equator. The other coordinate is right ascension.
a coordinate which, along with right ascension, may be used to locate any position in the sky. Declinatin is analogous to latitude for locating positions on the Earth. (See also text in ChanMp, and Ave.)
Part of a coordinate system (with "right ascention") for astronomical objects. Declination is the distance, in degrees, away from the celestial equator. Positive values indicate the object is north of the celestial equator, negative values indicate the object is south of the celestial equator. Declination is independent of the observer's location. (See Figure 1)
The angular difference between true north and magnetic north, the direction a magnetic compass points in the northern hemisphere. When making measurements with a magnetic compass, a correction for the local declination is essential to proper survey or location of features on the ground.
angular distance on the celestial sphere north or south of the celestial equator. It is measured along the hour circle passing through the celestial object. Declination is usually given in combination with right ascension or hour angle.
(of the sun): the angular distance of the Sun above or below the celestial equator. Its value follows an annual sine wave like curve, varying between 0º at the equinoxes and ±23.4º (approx.) at the solstices. It has positive values when the Sun is above the celestial equator (summer in the Northern hemisphere) and negative when below.
(astronomy) the angular distance to a point on a celestial object measured north or south from the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere
The angular distance north and south from the celestial equator measured along a great circle passing through the celestial poles. (See Observations Using a Gnomon and The Construction and Use of a Sundial)
The angular measurement of a point according to the celestial sphere, corresponding to an angle above or below the celestial equator. Equivalent to latitude in terrestrial measurements. The complement to right ascension.
along with right ascension, a measure of celestial position. Declination is analogous to latitude on Earth's surface, and measures an angular displacement north or south from the projection of Earth's equator on the celestial sphere to the location of a celestial body. See Celestial Sphere Figure.
One of two coordinates for the celestial sphere, which are analogous to latitude and longitude for the Earth's surface. The declination of an object is how many degrees it is north or south of the celestial equator. The other coordinate is called right ascension, and it is measured eastward from a somewhat arbitrary "prime meridian" on the sky. The "prime meridian" passes through the position of the Sun at the time of the vernal equinox. Thus its position changes slowly over the years, due to the precession of the equinoxes. The position of the celestial poles also changes with precession. Thus, to locate an object from its right ascension and declination, you must also know the date for which those coordinates are valid; that date is called the epoch of the coordinates.
The equivalent of Latitude, on the Celestial Sphere. Measured in degrees, from 0° at the celestial equator to 90° at the celestial North Pole and 90°S at the South one. The North Star is at almost 90°N.
This is the the number of degrees an object is north or south of the celestial equator. A declination of +20Â° means the celestial object is located 20Â° north of the celestial equator. The south polar cap is at a declination of â€“90Â°, the equator is at declination 0Â°, and the north polar cap is at a declination of +90Â°. Declination is to a celestial globe as latitude is to a terrestrial globe, a vertical positioning of an object.
The positions of stars and planets on the celestial sphere can be plotted using right ascension or R.A. and declination. These are the equivalent to latitude and longitude on Earth. Declination is measured North or South from the celestial equator in degrees, arc-minutes and arc-seconds. The celestial poles are at a declination of 90°N and 90°S. Stars always have the same R.A. and dec, because they do not move on the celestial sphere. Planets however are always moving and their position has to be checked regularly by observers.
Simply stated, declination (or variation) is the error between true North (which is what all maps are based on), and magnetic North (which is what all magnetic compass needles point to). The declination angle is different all over the world. In Australia it varies by as much as 18 degrees from coast to coast.
One of two coordinates describing a celestial object's position on the celestial sphere. Declination is the celestial equivalent of latitude. An object's declination is its position north or south of the celestial equator as measured in degrees, minutes and seconds. The north celestial pole, an extension of the Earth's north pole, has a declination of +90 degrees. The south celestial pole is at -90 degrees declination. Any object located along the celestial equator has a declination of 0 degrees.
In astronomy, the angular distance of a celestial body above (north, plus) or below (south, minus) the celestial Equator. Magnetic declination is the angular difference between magnetic north and true (geographic) north at the point of observation; it is not constant but varies with time because of the "wandering" of the magnetic north pole.
( - delta) - Equivalent to degrees of Latitude on Earth. A "+" (plus) Declination starts at 0 (zero) degrees at the Celestial Equator and goes up to +90 degrees which is the Celestial North Pole. A "-" (minus) Declination starts at 0 (zero) degrees at the Celestial Equator and goes down to -90 degrees which is the Celestial South Pole. For example the cooridinates (position) for a certain star can be expressed as a Declination of -42d14m37s. This locates the vertical position (+ or -) and is used in conjuction with the Right Ascension to define the exact location on the Celestial Sphere. An example of a complete set of coordinates (RA & Dec.) is 12h25m13s-42d14m37s. Also see Right Ascension.
The angular distance of an object relative to the celestial equator, expressed in degrees. The celestial equivalent of latitude on Earth's surface. Distances north of the celestial equator are positive; distances south are negative. The declination of the celestial equator is 0°; the declination of the north celestial pole is +90°, and the declination of the south celestial pole is -90°.
The angle in degrees of a celestial object measured from the Celestial Equator to the Celestial Pole (+ in the northern hemisphere and - in the southern). Double Star Two stars appearing very close togeather. If related they are called physical doubles; If unrelated, they are called optical doubles.
On of the coordinates used to define position on the celestial sphere in the equatorial coordinate system. Declination is the equivalent of latitude on the Earth. It is the angular distance, measured in degrees, north or south of the celestial equator . Northerly declinations are positive and southerly ones negative.
A system for measuring the altitude of a celestial object, expressed as degrees north, or south, of the celestial equator. Angles are positive if a point is North of the celestial equator, and negative if South. It is used, in conjunction with Right Ascension, to locate celestial objects.
Declination refers to the difference in degrees between true north and magnetic north in any given position on the earth. Declination is not consistent throughout the globe, because magnetic north slowly shifts and some points are closer to magnetic north than others. Some compasses (mostly handheld models) can be calibrated to account for declination, which is not recommended for vehicle compass units.
the angle between true (geographic) north and magnetic north (direction of the compass needle). Declination varies from place to place and can be 'set' on a compass for a particular location. Return to
The angle in degrees difference between magnetic north, as read on a compass, and true north. Declination is different on different parts of the globe. The declination for one's locale can be determined in many ways. Contact the nearest office of the Forest Service or BLM. Many compasses come with declination maps.
One of two coordinates (see also: right ascension) used to define the position of an object on the sky. Declination (Dec) is the angular distance of the object north (+) or south (-) off the celestial equator. Equivalent to terrestrial latitude.
The angle between the magnetic north meridian and the true north meridian at any given location. It is said to be 'east' or 'west' by a certain number of degrees according to whether the magnetic north meridian is east or west of the true north meridian.
Angular distance north or south of the celestial equator, taken as positive when north of the equator and negative when south. The Sun passes through its declinational cycle once a year, reaching its maximum north declination of approximately 23-1/2° about June 21 and its maximum south declination of approximately 23-1/2° about December 21. The Moon has an average declinational cycle of 27-1/3 days which is called a tropical month. Tides or tidal currents occurring near the times of maximum north or south declination of the Moon are called tropic tides or tropic currents, and those occurring when the Moon is over the Equator are called equatorial tides or equatorial currents. The maximum declination reached by the Moon in successive months depends upon the longitude of the Moon's node, and varies from 28-1/2" when the longitude of the ascending node is 0°, to 18-1/2" when the longitude of the node is 180°. The node cycle, or time required for the node to complete a circuit of 360° of longitude, is approximately 18.6 years. See epoch (2).
The measure in degrees of the position of a celestial object north or south of the celestial equator. If an object is on the celestial equator, it has a declination of 0 degrees, and if it is on the north or south celestial pole, it has a declination of +90 degrees or –90 degrees. Declination is analogous to latitude on the Earth, which measures terrestrial positions north or south of the equator. right ascension and declination together comprise a coordinate system that allows astronomers to locate objects in the sky. See also equatorial coordinates right ascension
Difference in degrees or angle between true north and magnetic north. To locate declination angle, visit the following sites: To locate a declination in the United States: www.ngdc.noaa.gov 1. Enter your zip code in the area provided 2. Click "Get Location" 3. Scroll down and click "Compute" To locate a declination in Canada: http://www.gsc.nrcan.gc.ca/geomag/field/mdcalc_e.php
Declination is one of the measurements used to describe a planet's position in the sky using the Equatorial Co-ordinate System. It indicates a planet's position North or South of the Celestial Equator.
(dec): position on the celestial sphere that is the number of degrees an object is north or south of the celestial equator. It is a projection of latitude lines onto the sky. An object's declination is fixed with respect to the stars. Varies from --90° at the SCP to 0° at the celestial equator to +90° at the NCP. Vertical position of an object.
measurement of angular elevation of object in celestial coordinates, with zero set at the celestial equator and +90 degrees at the north celestial pole. (analogous to latitude) See the Astro 201 page on celestial sphere and the general Astro 201 topical page on the night sky.
Distance of a planet north or south of the celestial equator. Every part of the ecliptic has declination except the beginnings of Aries and Libra (0°00'), because the plane of the ecliptic is not parallel with that of the celestial equator, which meet at those two points. The Sun has maximum declination of 23°28', when it reaches the tropics of Cancer in the north (23°N28') and Capricorn in the south (23°S28'). Declination is due to the inclination of the earth in orbit. See Parallel.
One of two celestial coordinates required to locate an astronomical object, such as a star, on the celestial sphere. Declination is the measure of angular distance of a celestial object above or below the celestial equator and is comparable to latitude. To familiarize yourself with declination, hold out your arm in the direction of the North Star (Polaris). You are now pointing at plus 90 degrees declination. Move your arm downward by 90 degrees. You are now pointing at 0 degrees declination.
The term that describes the distance in degrees a planet lies north or south of the celestial equator. The maximum declination of the Sun is reached at the Tropic of Cancer (north declination) and Tropic of Capricorn (south), 23°27'. Planets that occupy the same degree and direction of declination are parallel; those that occupy the same numerical degree but lie in opposite directions relative to the celestial equator are in contaparallel.
In astronomy, declination (abbrev. dec or Î´) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. Dec is comparable to latitude, projected onto the celestial sphere, and is measured in degrees north and south of the celestial equator. Therefore, points north of the celestial equator have positive declination, while those to the south have negative declination.