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Circle of equal altitude, the Glossary

Index Circle of equal altitude

The circle of equal altitude, also called circle of position (CoP), is defined as the locus of points on Earth on which an observer sees a celestial object such as the sun or a star, at a given time, with the same observed altitude.[1]

Table of Contents

  1. 18 relations: Almucantar, Celestial navigation, Dead reckoning, Greenock, Horizontal coordinate system, Hour angle, Intercept method, Locus (mathematics), Longitude by chronometer, Navigation, Scotland, Sextant, Sight reduction, Smalls Lighthouse, South Carolina, Subsolar point, Thomas Hubbard Sumner, Wales.

  2. Celestial navigation

Almucantar

An almucantar (also spelled almucantarat or almacantara) is a circle on the celestial sphere parallel to the horizon. Circle of equal altitude and almucantar are celestial navigation.

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Celestial navigation

Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the surface of the Earth without relying solely on estimated positional calculations, commonly known as dead reckoning. Circle of equal altitude and celestial navigation are navigation.

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Dead reckoning

In navigation, dead reckoning is the process of calculating the current position of a moving object by using a previously determined position, or fix, and incorporating estimates of speed, heading (or direction or course), and elapsed time. Circle of equal altitude and dead reckoning are navigation.

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Greenock

Greenock (Greenock; Grianaig) is a town in Inverclyde, Scotland, located in the west central Lowlands of Scotland.

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Horizontal coordinate system

The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles of a spherical coordinate system: altitude and azimuth.

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Hour angle

In astronomy and celestial navigation, the hour angle is the dihedral angle between the meridian plane (containing Earth's axis and the zenith) and the hour circle (containing Earth's axis and a given point of interest).

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Intercept method

In astronomical navigation, the intercept method, also known as Marcq St. Circle of equal altitude and intercept method are celestial navigation and navigation.

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Locus (mathematics)

In geometry, a locus (plural: loci) (Latin word for "place", "location") is a set of all points (commonly, a line, a line segment, a curve or a surface), whose location satisfies or is determined by one or more specified conditions.

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Longitude by chronometer

Longitude by chronometer is a method, in navigation, of determining longitude using a marine chronometer, which was developed by John Harrison during the first half of the eighteenth century. Circle of equal altitude and longitude by chronometer are navigation.

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Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.

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Scotland

Scotland (Scots: Scotland; Scottish Gaelic: Alba) is a country that is part of the United Kingdom.

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Sextant

A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. Circle of equal altitude and sextant are celestial navigation.

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Sight reduction

In astronavigation, sight reduction is the process of deriving from a sight (in celestial navigation usually obtained using a sextant) the information needed for establishing a line of position, generally by intercept method. Circle of equal altitude and sight reduction are celestial navigation and navigation.

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Smalls Lighthouse

Smalls Lighthouse is a lighthouse that stands on the largest of a group of wave-washed basalt and dolerite rocks known as The Smalls approximately west of Marloes Peninsula in Pembrokeshire, Wales, and west of Grassholm.

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South Carolina

South Carolina is a state in the coastal Southeastern region of the United States.

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Subsolar point

The subsolar point on a planet is the point at which its Sun is perceived to be directly overhead (at the zenith); that is, where the Sun's rays strike the planet exactly perpendicular to its surface.

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Thomas Hubbard Sumner

Thomas Hubbard Sumner (20 March 1807 – 9 March 1876) was a sea captain during the 19th century.

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Wales

Wales (Cymru) is a country that is part of the United Kingdom.

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See also

Celestial navigation

References

[1] https://en.wikipedia.org/wiki/Circle_of_equal_altitude