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54 relations: Anti-sidereal time, Astrometry, Astronomer, Astronomical object, Axial precession, Celestial coordinate system, Celestial equator, Celestial pole, Civil time, Declination, Diurnal motion, Earth's rotation, Equinox (celestial coordinates), Fixed stars, Geodesy, Great circle, IERS Reference Meridian, International Celestial Reference Frame, Lunar month, March equinox, Mercury (planet), Meridian (astronomy), Minute and second of arc, Moon, Night sky, Nocturnal (instrument), Nutation, Orthogonality, Parallax, Planet, Proper motion, Pulsar timing array, Radian, Radio astronomy, Retrograde and prograde motion, Right ascension, Scenic viewpoint, Second, Sidereal year, Solar time, Sun, Sundial, Synodic day, Telescope, Terrestrial Time, Timekeeper, Transit (astronomy), Transit instrument, Tropical year, Universal Time, ..., Uranus, Venus, Very-long-baseline interferometry, Zenith telescope. Expand index (4 more) »
Anti-sidereal time
Anti-sidereal time and extended-sidereal time are artificial time standards used to analyze the daily variation in the number of cosmic rays received on Earth.
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Astrometry
Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies.
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Astronomer
An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside the scope of Earth.
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Astronomical object
An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe.
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Axial precession
In astronomy, axial precession is a gravity-induced, slow, and continuous change in the orientation of an astronomical body's rotational axis.
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Celestial coordinate system
In astronomy, a celestial coordinate system is a system for specifying positions of celestial objects: satellites, planets, stars, galaxies, and so on.
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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 pole
The north and south celestial poles are the two imaginary points in the sky where the Earth's axis of rotation, indefinitely extended, intersects the celestial sphere.
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Civil time
In modern usage, civil time refers to statutory time scales designated by civilian authorities, or to local time indicated by clocks.
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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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Diurnal motion
Diurnal motion (lit, from dies, lit. "day") is an astronomical term referring to the apparent daily motion of stars around Earth, or more precisely around the two celestial poles.
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Earth's rotation
Earth's rotation is the rotation of Planet Earth around its own axis.
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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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Fixed stars
The fixed stars (stellae fixae) comprise the background of astronomical objects that appear to not move relative to each other in the night sky compared to the foreground of Solar System objects that do.
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Geodesy
Geodesy, also known as geodetics, is the earth science of accurately measuring and understanding three of Earth's fundamental properties: its geometric shape, orientation in space, and gravitational field.
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Great circle
A great circle, also known as an orthodrome, of a sphere is the intersection of the sphere and a plane that passes through the center point of the sphere.
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IERS Reference Meridian
The IERS Reference Meridian (IRM), also called the International Reference Meridian, is the prime meridian (0° longitude) maintained by the International Earth Rotation and Reference Systems Service (IERS).
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International Celestial Reference Frame
In astrometry, an International Celestial Reference Frame (ICRF) is a realization of the International Celestial Reference System (ICRS) using reference celestial sources observed at radio wavelengths.
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Lunar month
In lunar calendars, a lunar month is the time between two successive syzygies (new moons or full moons).
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March equinox
The March equinox or Northward equinox is the equinox on the Earth when the subsolar point appears to leave the southern hemisphere and cross the celestial equator, heading northward as seen from Earth.
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Mercury (planet)
Mercury is the smallest and innermost planet in the Solar System.
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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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Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
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Moon
The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite.
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Night sky
The term night sky, usually associated with astronomy from Earth, refers to the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon.
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Nocturnal (instrument)
A nocturnal is an instrument used to determine the local time based on the relative positions of two or more stars in the night sky.
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Nutation
Nutation (from Latin nūtātiō, "nodding, swaying") is a rocking, swaying, or nodding motion in the axis of rotation of a largely axially symmetric object, such as a gyroscope, planet, or bullet in flight, or as an intended behavior of a mechanism.
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Orthogonality
In mathematics, orthogonality is the generalization of the notion of perpendicularity to the linear algebra of bilinear forms.
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Parallax
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
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Planet
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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Proper motion
Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.
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Pulsar timing array
A pulsar timing array (PTA) is a set of pulsars which is analyzed to search for correlated signatures in the pulse arrival times.
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Radian
The radian (SI symbol rad) is the SI unit for measuring angles, and is the standard unit of angular measure used in many areas of mathematics.
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Radio astronomy
Radio astronomy is a subfield of astronomy that studies celestial objects at radio frequencies.
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Retrograde and prograde motion
Retrograde motion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is the central object (right figure).
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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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Scenic viewpoint
A scenic viewpoint – also called an observation point, viewpoint, viewing point, vista point, lookout, scenic overlook,These terms are more commonly used in North America.
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Second
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
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Sidereal year
A sidereal year (from Latin sidus "asterism, star") is the time taken by the Earth to orbit the Sun once with respect to the fixed stars.
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Solar time
Solar time is a calculation of the passage of time based on the position of the Sun in the sky.
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Sun
The Sun is the star at the center of the Solar System.
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Sundial
A sundial is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky.
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Synodic day
A synodic day is the period it takes for a planet to rotate once in relation to the body it is orbiting.
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Telescope
A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).
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Terrestrial Time
Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth.
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Timekeeper
A timekeeper (also spelled time keeper and time-keeper) is an instrument or person that measures the passage of time.
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Transit (astronomy)
In astronomy, a transit or astronomical transit is the phenomenon of at least one celestial body appearing to move across the face of another celestial body, hiding a small part of it, as seen by an observer at some particular vantage point.
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Transit instrument
In astronomy, transit instruments are used for the precise observation of star positions.
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Tropical year
A tropical year (also known as a solar year) is the time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice.
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Universal Time
Universal Time (UT) is a time standard based on Earth's rotation.
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Uranus
Uranus is the seventh planet from the Sun.
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Venus
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.
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Very-long-baseline interferometry
Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy.
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Zenith telescope
A zenith telescope is a type of telescope that is designed to point straight up at or near the zenith.
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Redirects here:
Earth Rotation Angle, Greenwich Sidereal Time, Local Sidereal Time, Local sidereal time, Mean sidereal time, Sideral day, Sideral time, Sidereal Time, Sidereal clock, Sidereal day, Sidereal motion, Sidereal rate, Siderial clock, Siderial time.
References
[1] https://en.wikipedia.org/wiki/Sidereal_time
