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20 relations: Angle, Astronomy, Axial tilt, Celestial equator, Celestial navigation, Celestial sphere, Clock position, Declination, Equatorial coordinate system, Equinox (celestial coordinates), Hour circle, Longitude, Meridian (astronomy), Noon, Prime meridian, Right ascension, Sidereal time, Solar zenith angle, Trigonometric functions, Zenith.
Angle
In plane geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.
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Astronomy
Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
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Axial tilt
In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.
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Celestial equator
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.
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Celestial navigation
Celestial navigation, also known as astronavigation, is the ancient and modern practice of position fixing that enables a navigator to transition through a space without having to rely on estimated calculations, or dead reckoning, to know their position.
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Celestial sphere
In astronomy and navigation, the celestial sphere is an abstract sphere with an arbitrarily large radius concentric to Earth.
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Clock position
A clock position is the relative direction of an object described using the analogy of a 12-hour clock to describe angles and directions.
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Declination
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
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Equatorial coordinate system
The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects.
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Equinox (celestial coordinates)
In astronomy, equinox is a moment when the vernal point, celestial equator, and other such elements are taken to be used in the definition of a celestial coordinate system.
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Hour circle
In astronomy, the hour circles, which together with declination and distance (from the centre of mass of the planet) locate any celestial object, is the great circle through the object and the two celestial poles.
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Longitude
Longitude, is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.
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Meridian (astronomy)
In astronomy, the meridian is the great circle passing through the celestial poles, the zenith, and the nadir of an observer's location.
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Noon
Noon (also midday or noon time) is 12 o'clock in the daytime, as opposed to midnight.
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Prime meridian
A prime meridian is a meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°.
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Right ascension
Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.
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Sidereal time
Sidereal time is a timekeeping system that astronomers use to locate celestial objects.
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Solar zenith angle
The solar zenith angle is the angle between the zenith and the centre of the Sun's disc.
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Trigonometric functions
In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) are functions of an angle.
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Zenith
The zenith is an imaginary point directly "above" a particular location, on the imaginary celestial sphere.
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Greenwich Hour Angle, Greenwich hour angle, Hour-angle, Local hour angle, Meridian angle, Sidereal hour angle.
