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Conceptual tool in astronomy
In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in
Celestial_sphere
Elements of some cosmological models
The celestial spheres, or celestial orbs, were the fundamental entities of the cosmological models developed by Plato, Eudoxus, Aristotle, Ptolemy, Copernicus
Celestial_spheres
Imaginary sky rotation points
and south celestial poles are the two points in the sky where Earth's axis of rotation, indefinitely extended, intersects the celestial sphere. The north
Celestial_pole
Southern half of the celestial sphere
southern celestial hemisphere, also called the Southern Sky, is the southern half of the celestial sphere; that is, it lies south of the celestial equator
Southern_celestial_hemisphere
Model of objects in the sky consisting of a framework of rings
armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting
Armillary_sphere
Northern half of the celestial sphere
northern celestial hemisphere, also called the Northern Sky, is the northern half of the celestial sphere; that is, it lies north of the celestial equator
Northern_celestial_hemisphere
System for specifying positions of celestial objects
direction on a celestial sphere, if the object's distance is unknown or trivial. Spherical coordinates, projected on the celestial sphere, are analogous
Astronomical coordinate systems
Astronomical_coordinate_systems
Set of points equidistant from a center
in equilibrium. The Earth is often approximated as a sphere in geography, and the celestial sphere is an important concept in astronomy. Manufactured items
Sphere
Projection of Earth's equator out into space
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of a planet, by convention generally Earth
Celestial_equator
Astronomical instrument
the celestial sphere visible to the observer, and its projection on the celestial equatorial plane. The geographic south of the celestial sphere acts
Astrolabe
Classical theories concerning movement of spheres
different theories about the dynamics of the celestial spheres. They explained the motions of the various nested spheres in terms of the materials of which they
Dynamics of the celestial spheres
Dynamics_of_the_celestial_spheres
Star charts arranged on a globe
positioned at the centre of the celestial sphere, is of the gnomonic projection inside of the celestial sphere, whereas the celestial globe is orthographic projection
Celestial_globe
Sculpture
The Celestial Sphere (also known as the Woodrow Wilson Memorial Sphere) is an armillary sphere artpiece situated in the Palais des Nations in Geneva, Switzerland
Celestial Sphere Woodrow Wilson Memorial
Celestial_Sphere_Woodrow_Wilson_Memorial
Type of astronomical bodies
exist attached on a giant celestial sphere, or firmament, which revolves daily around Earth. Hence it was known as the "sphere of fixed stars", which acted
Fixed_stars
Scale model of a celestial body
A globe is a spherical model of Earth, of some other celestial body, or of the celestial sphere. Globes serve purposes similar to maps, but, unlike maps
Globe
Apparent path of the Sun on the celestial sphere
ecliptic or ecliptic plane is the apparent path of the Sun on the celestial sphere, resulting from Earth's orbit around the Sun. It was a central concept
Ecliptic
Type of celestial coordinate system
separating the hemispheres is the celestial horizon, which is defined as the great circle on the celestial sphere whose plane is normal to the local
Horizontal_coordinate_system
Apparent solar time minus mean solar time
representing the angular offset of the Sun from its mean position on the celestial sphere as viewed from Earth. The equation of time values for each day of the
Equation_of_time
upon the celestial sphere. hour circle Any imaginary great circle drawn upon the celestial sphere that passes through both of the celestial poles and
Glossary_of_astronomy
Deity in Greek mythology
astronomy. In antiquity, he was credited with inventing the first celestial sphere. In some texts, he is even credited with the invention of astronomy
Atlas_(mythology)
Great semicircle passing through the celestial poles
anti-meridian), and the intersection of the plane with the celestial sphere is the celestial meridian for that location and time. There are several ways
Meridian_(astronomy)
Timekeeping system on Earth relative to the celestial sphere
fixed stars on the theoretical celestial sphere. More exactly, sidereal time is the angle, measured along the celestial equator, from the observer's meridian
Sidereal_time
Calculating the Sun's location in the sky at a given time and place
year, the Sun appears to move with respect to the fixed stars on the celestial sphere, along a circular path called the ecliptic. Earth's rotation about
Position_of_the_Sun
Superseded description of the Universe with Earth at the center
around Earth about once per day. The stars appeared to be fixed on a celestial sphere rotating once each day about an axis through the geographical poles
Geocentrism
Postulated primary cause of all activity in the universe
aetheric celestial sphere emulates one of the unmoved movers, as best it can, by uniform circular motion. The first heaven, the outmost sphere of fixed
Unmoved_mover
Group of stars on the celestial sphere
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal
Constellation
1543 book by Copernicus describing his heliocentric theory of the universe
De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres) is the seminal work on the heliocentric theory[citation needed] of the
De revolutionibus orbium coelestium
De_revolutionibus_orbium_coelestium
Time period in ancient historical and astrological theories of time
continuous motion of the celestial sphere. This discovery was groundbreaking because it revealed that the celestial sphere was not as fixed as previously
Astrological_age
Twice-annual astronomical event when the Sun is farthest from above the Earth's equator
most northerly or southerly sun path relative to the celestial equator on the celestial sphere. Two solstices occur annually, around 20–22 June and 20–22
Solstice
Topics referred to by the same term
also known as a celestial body or object Celestial coordinate system, a system for mapping positions on the celestial sphere Celestial mechanics, the branch
Celestial
Celestial coordinate system used to specify the positions of celestial objects
consisting of the projection of Earth's equator onto the celestial sphere (forming the celestial equator), a primary direction towards the March equinox
Equatorial_coordinate_system
Designated common star constellations
constellations sharing some defining characteristic, such as proximity on the celestial sphere, common historical origin, or common mythological theme. In the Western
Constellation_family
Unobstructed view upward from Earth
In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere, concentric to the Earth, on which the Sun, Moon, planets
Sky
Imaginary point directly above a particular location, on the imaginary celestial sphere
The zenith (UK: /ˈzɛnɪθ/, US: /ˈziː-/) is the imaginary point on the celestial sphere directly "above" a particular location. "Above" means in the vertical
Zenith
Principal meridians of the celestial sphere
celestial sphere. The term is now rarely used and may be considered obsolete. The equinoctial colure is the meridian or great circle of the celestial
Colure
Point on the celestial sphere
constellation of Aries, it is one of the two points on the celestial sphere at which the celestial equator crosses the ecliptic, the other being the first
First_point_of_Aries
seems to turn around the North star, which led him to the concept of a Celestial sphere around Earth. And, as the sky seems to vary with latitude, he also
Ancient_Greek_astronomy
Lie group of Lorentz transformations
Minkowski spacetime and are modeled by points on the celestial sphere. Then a given point on the celestial sphere can be associated with ξ = u + iv, a complex
Lorentz_group
Branch of astronomy about the celestial sphere
observational astronomy used to locate astronomical objects on the celestial sphere, as seen at a particular date, time, and location on Earth. It relies
Spherical_astronomy
Painting attributed to Leonardo da Vinci
his left, signalling his role as Salvator Mundi and representing the celestial sphere of the heavens. Approximately thirty copies and variations of the work
Salvator_Mundi_(painting)
Astronomical equivalent of longitude
these astronomical coordinates specify the location of a point on the celestial sphere in the equatorial coordinate system. An old term, right ascension (Latin:
Right_ascension
Astronomical coordinate analogous to latitude
(abbreviated dec; symbol δ) is the angular distance from the celestial equator on the celestial sphere; when paired with right ascension, it forms the equatorial
Declination
Area of the sky divided into twelve signs
approximately 8° north and south celestial latitude of the ecliptic – the apparent path of the Sun across the celestial sphere over the course of the year
Zodiac
Ancient Roman statue of Greek Deity
Zeus to hold up the sky. The sphere shows a depiction of the night sky as seen from outside the outermost celestial sphere, with low reliefs depicting
Farnese_Atlas
Class of star chart
planisphere. The term planisphere contrasts with armillary sphere, where the celestial sphere is represented by a three-dimensional framework of rings.
Planisphere
Primary directions in astrology
fixed on the celestial sphere relative to the local horizon. The promittor moves along with the daily rotation of the celestial sphere until it approaches
Primary_direction_(astrology)
The Moon's circuit around Earth
distance of approximately its diameter, or about half a degree on the celestial sphere, each hour. The Moon differs from most regular satellites of other
Orbit_of_the_Moon
Coordinates used in the equatorial coordinate system
with the declination to fully specify the location of a point on the celestial sphere in the equatorial coordinate system. The local hour angle (LHA) of
Hour_angle
The Celestial Sphere is a large scale oratorio for chorus and orchestra by Charles Wuorinen, commissioned by Augustana College (Rock Island, Illinois)
The_Celestial_Sphere
Celestial coordinate system used to describe Solar System objects
Celestial Sphere Durham University Department of Physics Equatorial ↔ Ecliptic coordinate converter MEASURING THE SKY A Quick Guide to the Celestial Sphere
Ecliptic_coordinate_system
Constellation in the northern celestial hemisphere
and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from Latin: Boōtēs, which comes from Ancient Greek:
Boötes
Change of rotational axis in an astronomical body
grid around the equator) moves. The celestial equator is just the Earth's equator projected onto the celestial sphere, so it moves as the Earth's equatorial
Axial_precession
American physicist (born 1993)
(September 28, 2017). "Flat space amplitudes and conformal symmetry of the celestial sphere". Physical Review D. 96 (6). arXiv:1701.00049. doi:10.1103/PhysRevD
Sabrina_Pasterski
Collection of maps
Earth. Advances in astronomy have also resulted in atlases of the celestial sphere or of other planets. Atlases have traditionally been bound into book
Atlas
Part of astronomy concerned with mapping of stars
with mapping stars, galaxies, and other astronomical objects on the celestial sphere. Measuring the position and light of charted objects requires a variety
Celestial_cartography
Topics referred to by the same term
sphere-like region or shell. Sphere may also refer to: Armillary sphere, a physical model of the celestial sphere Celestial sphere, the astronomical description
Sphere_(disambiguation)
Astronomical location
an equinox is either of two places on the celestial sphere at which the ecliptic intersects the celestial equator. Although there are two such intersections
Equinox (celestial coordinates)
Equinox_(celestial_coordinates)
Earth's axis, or a Heaven-Earth connection
axis of Earth between the celestial poles. In a geocentric coordinate system, this is the axis of rotation of the celestial sphere. Consequently, in ancient
Axis_mundi
Polarization pattern of the daytime sky
9 o'clock, 6 o'clock, and 3 o'clock (counter-clockwise around the celestial sphere, since the observer is looking up at the sky). Note that because the
Rayleigh_sky_model
Rational function of the form (az + b)/(cz + d)
of the Lorentz group acts on the celestial sphere in the same way that the Möbius group acts on the Riemann sphere. In fact, these two groups are isomorphic
Möbius_transformation
Zodiac constellation in the northern hemisphere
temperatures similar to Earth. At the (angular) heart of this sector of our celestial sphere is Praesepe (Messier 44), one of the closest open clusters to Earth
Cancer_(constellation)
Hindu deity representing ascending lunar node
intersection of the paths of the Sun and the Moon as they move on the celestial sphere. Therefore, Rahu and Ketu are respectively the personification in Hindu
Rahu
from a previous Gunpla academy that was owned by PPSE. Celestial Sphere gets its name from Celestial Being of Mobile Suit Gundam 00. Wilfrid Kijima (キジマ・ウィルフリッド
List of Gundam Build Fighters Try characters
List_of_Gundam_Build_Fighters_Try_characters
Part of celestial coordinate system
the celestial equator. By contrast, the declination of an object viewed on the celestial sphere is the angle of that object to/from the celestial equator
Hour_circle
1603 star atlas produced by Johann Bayer
"measuring the heavens". It was the first atlas to cover the entire celestial sphere. Uranometria contains 51 star charts, engraved on copper plates by
Uranometria
Science of measuring the shape, orientation, and gravity of Earth
for the south celestial pole.) Celestial equator: the (instantaneous) intersection of Earth's equatorial plane with the celestial sphere. Meridian plane:
Geodesy
are among the brightest and span thirty-eight constellations of the celestial sphere from the declination of −70° to +89°. Many of the selected stars were
List_of_stars_for_navigation
Projection of a sphere through its center onto a plane
originated in astronomy for constructing sundials and charting the celestial sphere. It is commonly used as a geographic map projection, and can be convenient
Gnomonic_projection
Time of one rotation around a planet axis
fluctuation of a solar day, and stellar day and sidereal day (using the celestial sphere) used for astronomy. In some countries outside of the tropics, daylight
Day
Natural sciences as described by Aristotle
the cosmos into concentric spheres, with the Earth at the centre and celestial spheres around it. The terrestrial sphere was made of four elements, namely
Aristotelian_physics
Diagrammatic representation of Sun's position over a period of time
line along the celestial equator. The north–south component of the analemma shows the Sun's declination, its latitude on the celestial sphere, or the latitude
Analemma
Direction on Earth's surface
representation avoids those limitations. The celestial pole is the location on the imaginary celestial sphere where an imaginary extension of the rotational
True_north
Mathematician and astronomer (1473–1543)
book De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres), just before his death in 1543, was a major event in the history
Nicolaus_Copernicus
Historical views about extraterrestrial life
Earth was a perfect sphere, as they associated circles and spheres with mathematical perfection. The model of the celestial sphere works for distant stars
History of the extraterrestrial life debate
History_of_the_extraterrestrial_life_debate
Point on the celestial sphere opposite Sun
The antisolar point is the abstract point on the celestial sphere directly opposite the Sun from an observer's perspective. This means that the antisolar
Antisolar_point
Astrological chart or diagram
and is considered to be at the centre of the celestial sphere. The celestial sphere is an imaginary sphere onto which the zodiac, constellations and planets
Horoscope
Plane used to define orbital elements
orbiting with intermediate-to-large semi-major axes The plane tangent to celestial sphere for extrasolar objects On the plane of reference, a zero-point must
Orbital_plane_of_reference
Coordinate frames
ECI. The ECI frame is also useful for specifying the direction toward celestial objects: To represent the positions and velocities of terrestrial objects
Earth-centered_inertial
Interpretations of the planets of the Solar System
is considered to form the first celestial sphere above Earth. Everything below the Moon is part of the sublunary sphere. Mercury moves the second fastest
Planets_in_astrology
Region in the geocentric cosmos below the Moon
to the sublunary sphere. Medieval scholastics like Thomas Aquinas, who charted the division between celestial and sublunary spheres in his work Summa
Sublunary_sphere
Two objects on opposite sides of the celestial sphere
are said to be in opposition when they are on opposite sides of the celestial sphere, as observed from a given body (usually Earth). A planet (or asteroid
Opposition_(astronomy)
Angle between the rotational axis and orbital axis of a body
ecliptic, being the angle between the ecliptic and the celestial equator on the celestial sphere. It is denoted by the Greek letter ε. Earth currently
Axial_tilt
Celestial coordinate system
to the orbital plane. Projected onto the celestial sphere, orbital poles are similar in concept to celestial poles, but are based on the body's orbit
Orbital_pole
Zodiac constellation in the northern hemisphere
39th in overall size, with an area of 441 square degrees (1.1% of the celestial sphere). Aries has represented a ram since late Babylonian times. Before that
Aries_(constellation)
Ancient Greek analogue astronomical computer
front face was to position astronomical bodies with respect to the celestial sphere along the ecliptic, in reference to the observer's position on the
Antikythera_mechanism
Sanskrit astronomical treatise by Aryabhata
verses): Geometric/trigonometric aspects of the celestial sphere, features of the ecliptic, celestial equator, node, shape of the Earth, cause of day
Aryabhatiya
Spherical triangle used in astronavigation
the globe. It is composed of three reference points on the celestial sphere: P is the Celestial Pole (either North or South). It is a fixed point. Z is the
Navigational_triangle
Polyhedral equal-area map projection
collected on a spherical surface (either that of the Earth or the celestial sphere). It was first proposed in 1975 by Chan and O'Neill for the Naval Environmental
Quadrilateralized spherical cube
Quadrilateralized_spherical_cube
Greek librarian, mathematician, geographer, and poet
Press. p. 179. ISBN 978-0-7914-5537-1. "Armillary sphere | Navigation, Celestial, Celestial Sphere". britannica.com. Retrieved 2025-11-13. Morris, Terry
Eratosthenes
Semi-annual astronomical event where the Sun is directly above the Earth's equator
directions north and south on the celestial sphere are in the sense toward the north celestial pole and toward the south celestial pole. East is the direction
Equinox
Moon stops moving north or south
around the celestial poles. (This daily cycle of apparent movement is called diurnal motion.) All the stars seem fixed on a celestial sphere surrounding
Lunar_standstill
Topics referred to by the same term
water hemispheres A half of the (geocentric) celestial sphere Northern celestial hemisphere Southern celestial hemisphere A cultural hemisphere The near
Hemisphere
Measurement unit for time
Science". 2023-07-20. Retrieved 2025-11-18. "Sidereal time | Celestial Coordinates, Celestial Sphere & Equinoxes | Britannica". www.britannica.com. Retrieved
Unit_of_time
Constellations recognized by the International Astronomical Union
arcs of right ascension and declination, together covering the entire celestial sphere. Their boundaries were officially adopted by the International Astronomical
IAU_designated_constellations
Measure in 3-dimensional geometry
the celestial sphere that an astronomical observer positioned at latitude θ can see as the Earth rotates. At the equator all of the celestial sphere is
Solid_angle
Celestial coordinate system
determined by their axis of rotation in relation to the celestial poles of the celestial sphere. Astronomical bodies include stars, planets, dwarf planets
Poles_of_astronomical_bodies
Classical element
motion. Aristotle also stated that celestial spheres made of aether held the stars and planets. The idea of aethereal spheres moving with natural circular motion
Aether_(classical_element)
Hindu deity representing descending lunar node
paths of Surya (the Sun) and Chandra (the Moon) as they move on the celestial sphere, and do not correspond to a physical planet. Rāhu and Ketu are respectively
Ketu_(mythology)
Spherical geometry analog of a straight line
, the center of the sphere. Some examples of great circles on the celestial sphere include the celestial horizon, the celestial equator, and the ecliptic
Great_circle
Celestial groupings used in Chinese astrology
Traditional Chinese astronomy has a system of dividing the celestial sphere into asterisms or constellations, known as "officials" (Chinese: 星官; pinyin:
Chinese_constellations
CELESTIAL SPHERE
CELESTIAL SPHERE
Boy/Male
Bengali, Christian, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Tamil, Telugu
Celestial
Male
Italian
Italian and Spanish form of Latin Cælestinus, CELESTINO means "heavenly."
Boy/Male
Tamil
Celestial
Boy/Male
French
This French name is based on the Latin 'caelestis' meaning 'heavenly'. Five popes have been named...
Girl/Female
French American Latin
This French name is based on the Latin 'caelestis' meaning 'heavenly'. Used as both a masculine...
Girl/Female
French American Latin
Heavenly.
Girl/Female
Indian, Sanskrit
Celestial
Girl/Female
Tamil
Celestial
Boy/Male
French
This French name is based on the Latin caelestis meaning 'heavenly'. Used as both a masculine and...
Female
English
English form of French Célestine, CELESTINE means "heavenly."
Girl/Female
Hindu, Indian, Kannada, Marathi, Sindhi, Tamil, Telugu
Celestial
Boy/Male
Indian, Sanskrit
Celestial
Boy/Male
Indian, Sanskrit
Celestial
Girl/Female
Hindu
Celestial
Girl/Female
Spanish Latin French
Heavenly.
Boy/Male
Indian, Sanskrit
Celestial
Girl/Female
Tamil
Celestial
Female
Italian
Feminine form of Italian/Spanish Celestino, CELESTINA means "heavenly."
Girl/Female
French Latin
Heavenly.
Boy/Male
Gujarati, Hindu, Indian, Kannada
Celestial
CELESTIAL SPHERE
CELESTIAL SPHERE
Girl/Female
Hindu, Indian, Traditional
Desired by Men
Girl/Female
Hindu
Boy/Male
Indian, Punjabi, Sikh
Dwelling in Naam
Boy/Male
Tamil
Rajnish | ரஜநீஷ , ரஜநீஷ
Ruler (Raj) of the night (Neesh), God of night (Moon)
Girl/Female
Tamil
Fearless
Boy/Male
Indian, Sanskrit
Sword
Surname or Lastname
English (mainly East Anglia and southern counties)
English (mainly East Anglia and southern counties) : unexplained.Possibly a shortened form of Mac Avey, a variant of McEvoy and McVey.Possibly an altered form of French Hévé.Alternatively, perhaps, an Americanized form of German Ewig.
Boy/Male
Arabic
Fine; Thin; Delicate
Girl/Female
Tamil
Enabling to crossover
Boy/Male
Celebrity, Hindu, Indian, Punjabi, Sikh, Traditional
Lord of Dharma and Righteousness; Lord of Religion
CELESTIAL SPHERE
CELESTIAL SPHERE
CELESTIAL SPHERE
CELESTIAL SPHERE
CELESTIAL SPHERE
a.
Belonging to the aerial regions, or visible heavens.
v. & a.
The orb of the fixed stars; the most rmote of the celestial spheres.
adv.
In a celestial manner.
a.
Higher than celestial; superangelic.
n.
An elevation of mind to things celestial.
n.
A chief angel; one high in the celestial hierarchy.
n.
A native of China.
v. t.
To make like heaven.
v. t.
To make celestial.
a.
Of or pertaining to the spiritual heaven; heavenly; divine.
n.
Alt. of Celestite
a.
Pertaining to the firmament; celestial; being of the upper regions.
n.
An inhabitant of heaven.
a.
Human; not celestial; not spiritual or divine.
n.
An imaginary circle or orbit in the heavens; one of the celestial spheres.
a.
Of or pertaining to the heavens; celestial; astronomical.
n.
One of the orders of the celestial hierarchy.
n.
A description of celestial phenomena, as rainbows, etc.
n.
Alt. of Celestinian
n.
Native strontium sulphate, a mineral so named from its occasional delicate blue color. It occurs crystallized, also in compact massive and fibrous forms.