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Sidereal time

Sidereal time ("sidereal" pronounced /saɪˈdɪəriəl, sə-/ sy-DEER-ee-əl, sə-) is a system of timekeeping used especially by astronomers. Using sidereal time and the celestial coordinate system, it is easy to locate the positions of celestial objects in the night sky. Sidereal time is a "time scale that is based on Earth's rate of rotation measured relative…

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Overview

Comparison to solar time

Effects of precession

Modern definitions

Sidereal days compared to solar days on other planets

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Map overview Semantic statistics

Sidereal time

Nodes68
Edges67
Triples52
Avg. degree1.97
Density0.029412
Components1

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Sidereal time

Top relations

related to Mean and apparent varieties · 16
Sidereal time → Although ERA, Earth, GAST, GMST, Greenwich, GST, IERS Reference Meridian, LAST, LMST, LST, Prime, Similarly, Since, The, There, When
related to Modern definitions · 12
Sidereal time → Beginning, Danjon, During, Earth Rotation Angle, January, March, Sidereal, Then, These, This, UT1, VLBI
has effect · 10
Sidereal time → Because, Earth, Earth's, For, In, International Celestial Reference Frame, It, Sun, The, This
related to Relationship between solar time and sidereal time intervals · 6
Sidereal time → If, January, Julian, Terrestrial Time, The, UT1
see also · 3
Sidereal time → Anti-sidereal, Celestial Reference FrameNocturnal, Sidereal
is a · 1
Sidereal time → angle
related to External links · 1
Sidereal time → Web-based Sidereal

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Important terminology

sidereal time rotation solar day earth earth's sun stars era one equinox year mean measured seconds around celestial period angle

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Sidereal timeis aangle0.90text
photographic zenith tubesinstance oftime was measured by observing stars with instruments0.80text
Danjon astrolabesinstance oftime was measured by observing stars with instruments0.80text
and the passage of stars across defined lines would be timed with the observatory clockinstance oftime was measured by observing stars with instruments0.80text
Sidereal timehas effectEarth's0.60section
Sidereal timehas effectThis0.60section
Sidereal timehas effectBecause0.60section
Sidereal timehas effectEarth0.60section
Sidereal timehas effectFor0.60section
Sidereal timehas effectThe0.60section
Sidereal timehas effectInternational Celestial Reference Frame0.60section
Sidereal timehas effectIn0.60section

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    Min side: 3
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