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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
Conceptual tool in astronomy
consideration of its linear distance from the observer. The celestial equator divides the celestial sphere into northern and southern hemispheres. Because
Celestial_sphere
Apparent path of the Sun on the celestial sphere
obliquity of the ecliptic. If the equator is projected outward to the celestial sphere, forming the celestial equator, it crosses the ecliptic at two points
Ecliptic
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
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. This
Southern_celestial_hemisphere
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. This
Northern_celestial_hemisphere
Imaginary line halfway between Earth's North and South poles
be used for any other celestial body that is roughly spherical. In spatial (3D) geometry, as applied in astronomy, the equator of a rotating spheroid
Equator
Semi-annual astronomical event where the Sun is directly above the Earth's equator
indicating that at that moment the solar declination is crossing the celestial equator in a northward direction, and southward equinox for the September
Equinox
Celestial coordinate system used to specify the positions of celestial objects
plane 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
Astronomical phenomenon time
toward the Sun is 23.44°. Likewise, the Sun's declination from the celestial equator is 23.44°. In areas outside the tropics, the sun reaches its highest
Summer_solstice
Astronomical equivalent of longitude
or the point on the celestial equator that rises with any celestial object as seen from Earth's equator, where the celestial equator intersects the horizon
Right_ascension
Astronomical location
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)
Imaginary sky rotation points
other words, Canopus is halfway between Sirius and the pole. Celestial sphere Celestial equator Circumpolar star Orbital pole Polaris Pole star Poles of astronomical
Celestial_pole
Twice-annual astronomical event when the Sun is farthest from above the Earth's equator
its most northerly or southerly sun path relative to the celestial equator on the celestial sphere. Two solstices occur annually, around 20–22 June and
Solstice
Zodiac constellation straddling the celestial equator
celestial equator within this constellation and Pisces. Underlying these technical two definitions, the sun passes directly overhead of the equator,
Virgo_(constellation)
Great semicircle passing through the celestial poles
points on the horizon, and it is perpendicular to the celestial equator and horizon. Meridians, celestial and geographical, are determined by the pencil of
Meridian_(astronomy)
telescopes. celestial equator The imaginary great circle of a body's celestial sphere that is coplanar with the body's terrestrial equator. On Earth, the
Glossary_of_astronomy
Babylonian astronomy and astrology
Eastern deities. The path of Anu is considered as a belt around the celestial equator with a width of roughly ±17° that is divided in twelve equal parts
MUL.APIN
Constellation straddling the celestial equator
(/ˌɒfiˈjuːkəs/ o-fee-YOO-kəs) is a large constellation straddling the celestial equator. Its name comes from the Ancient Greek ὀφιοῦχος (ophioûkhos), meaning
Ophiuchus
Zodiac constellation straddling the celestial equator
southwest and Aries, which is smaller, to the east. The ecliptic and the celestial equator intersect within this constellation, at the first point of Aries,
Pisces_(constellation)
Constellation straddling the celestial equator
depictions have followed these two models. Orion is located on the celestial equator, but it will not always be so located due to the effects of precession
Orion_(constellation)
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
Analemma
Calculation of elapsed time by the apparent position of the sun
circle (the ecliptic) that is tilted to Earth's celestial equator. When the Sun crosses the equator at both equinoxes, the Sun's daily shift (relative
Solar_time
Time period in ancient historical and astrological theories of time
correspond to the animals depicted in the tauroctony – all lay on the celestial equator (the location of which is shifted by the precession) and thus had
Astrological_age
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
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 point
First_point_of_Aries
Celestial coordinate system used to describe Solar System objects
It may be implemented in spherical or rectangular coordinates. The celestial equator and the ecliptic are slowly moving relative to the distant stars due
Ecliptic_coordinate_system
Coordinate frames
(or equivalently, the celestial North Pole) as it was at that time. The y-axis is rotated by 90° East about the celestial equator. M50: This frame is similar
Earth-centered_inertial
Division of the horoscope into 12 sectors
whether these divisions are made directly on the ecliptic, or on the celestial equator or some other great circle, before being projected on the ecliptic
House_(astrology)
System for specifying positions of celestial objects
divides the celestial sphere into two equal hemispheres and defines the baseline for the latitudinal coordinates, similar to the equator in the geographic
Astronomical coordinate systems
Astronomical_coordinate_systems
Current standard celestial reference system and frame
ascension based on the mean celestial equator and mean celestial equinox at the J2000 epoch. The International Celestial Reference Frame (ICRF) is a realization
International Celestial Reference System and its realizations
International_Celestial_Reference_System_and_its_realizations
When sun appears directly over equator
subsolar point appears to leave the Southern Hemisphere and cross the celestial equator, heading northward as seen from Earth. The March equinox is known
March_equinox
Apparent solar time minus mean solar time
which tracks a theoretical mean Sun with uniform motion along the celestial equator. Apparent solar time can be obtained by measurement of the current
Equation_of_time
Area of the sky divided into twelve signs
of its main star, Altair. Hydra in the Early Bronze Age marked the celestial equator and was associated with Leo, which is shown standing on the serpent
Zodiac
Moon stops moving north or south
or furthest south from the celestial equator (measured as an angle expressed in degrees called declination of a celestial coordinate system, analogous
Lunar_standstill
Constellation straddling the celestial equator
Ptolemy. Commonly represented as a water snake, it straddles the celestial equator. The Greek constellation of Hydra is an adaptation of a Babylonian
Hydra_(constellation)
Science of measuring the shape, orientation, and gravity of Earth
(Similarly for the south celestial pole.) Celestial equator: the (instantaneous) intersection of Earth's equatorial plane with the celestial sphere. Meridian
Geodesy
Star that never sets due to its apparent proximity to a celestial pole
circumpolar stars becomes increasingly small. At the Equator, this circle vanishes to a single point – the celestial pole itself – which lies on the horizon, and
Circumpolar_star
When sun appears directly over equator
southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward. Because of differences between the calendar year
September_equinox
Moon of Pluto
subtracting this angle from the north celestial pole of +90° gives the inclination with respect to the celestial equator: i = +90° – (+42°) = +48°. The instantaneous
Nix_(moon)
Constellation near the celestial equator
Aquila is a constellation on the celestial equator. Its name is Latin for 'eagle', and what it represents is mixed; some say it represents the bird that
Aquila_(constellation)
Intersection of Moon's orbit with Earth's ecliptic
south of the ecliptic. The ecliptic is inclined about 23.44° to the celestial equator, whose plane is perpendicular to the rotational axis of Earth. As
Lunar_node
the celestial sphere. This path is tilted 23° with respect to the celestial equator. The two locations where the ecliptic and the celestial equator meet
Ancient_Greek_astronomy
Angle between the rotational axis and orbital axis of a body
the 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
Faint constellation on the celestial equator
Monoceros (Greek: Μονόκερως, "unicorn") is a faint constellation on the celestial equator. Its definition is attributed to the 17th-century cartographer Petrus
Monoceros
Red dwarf star in the constellation Ophiuchus
of its proximity and favorable location for observation near the celestial equator. Historically, research on Barnard's Star has focused on measuring
Barnard's_Star
Apparent motion of celestial objects around Earth
The apparent motion of stars near the celestial pole seems slower than that of stars closer to the celestial equator. Conversely, following the diurnal motion
Diurnal_motion
Zodiac constellation straddling the celestial equator
is the only constellation crossed by all three of the galactic equator, celestial equator, and ecliptic. A ring-like galactic structure known as Gould's
Taurus_(constellation)
Part of celestial coordinate system
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
Navigational method
Latitude - measured north or south of the equational or celestial equator), of the observed celestial body is known. All that can be derived from a single
Longitude_by_chronometer
Group of stars on the celestial sphere
North Pole or South Pole, all constellations south or north of the celestial equator are circumpolar. Depending on the definition, equatorial constellations
Constellation
Geographic coordinate specifying north-south position
another celestial body. Latitude is given as an angle that ranges from −90° at the south pole to 90° at the north pole, with 0° at the Equator. Lines of
Latitude
Constellation in the northern celestial hemisphere
the 88 constellations recognised today. It lies just north of the celestial equator. With an apparent magnitude varying between 2.37 and 2.45, the brightest
Pegasus_(constellation)
Constellation on the celestial equator
Sextans is a faint, minor constellation on the celestial equator which was introduced in 1687 by Polish astronomer Johannes Hevelius. Its name is Latin
Sextans
Plane on which most of a disk-shaped galaxy's mass lies
be at position angle 123° from the north celestial pole. Thus the zero longitude point on the galactic equator was at 17h 42m 26.603s, −28° 55′ 00.445″
Galactic_plane
Calculating the Sun's location in the sky at a given time and place
axis towards the North celestial pole. The Sun appears to move northward during the northern spring, crossing the celestial equator on the March equinox
Position_of_the_Sun
Constellation in the northern celestial hemisphere
Delphinus is a small constellation in the Northern Celestial Hemisphere, close to the celestial equator. Its name is the Latin version for the Greek word
Delphinus
Celestial groupings used in Chinese astrology
on the north celestial pole and includes those stars which could be seen year-round, while the other two straddle the celestial equator. The Twenty-Eight
Chinese_constellations
Astrology term
which corresponds to the moment the Sun is perceived as crossing the celestial equator, each year marking the start of spring in the Northern Hemisphere
Age_of_Aquarius
Celestial coordinate system
measured from the celestial pole, similar to the way declination (dec, δ) is measured from the celestial equator. Polar distance in celestial navigation is
Polar_distance_(astronomy)
Early astronomical instrument
instrument. The instrument consists of three rings, representing the celestial equator, declination, and the meridian. It can be used as a sun dial to tell
Astronomical_rings
Twelve 30° sectors of the ecliptic, as defined by Western astrology
correct for this shifting. Astrology (i.e. a system of omina based on celestial appearances) was developed in Chinese and Tibetan cultures as well but
Astrological_sign
Change of rotational axis in an astronomical body
the circular 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
Axial_precession
and colonial Brazil, (or otherwise the celestial equator, but this interpretation is not supported by an celestial map, see figure). Some interpretations
Flag_of_Brazil
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 and
Aryabhatiya
Astronomical instrument
on the celestial sphere of Earth's main circles of latitude: In orange, the celestial Tropic of Cancer. In purple, the celestial equator. In green
Astrolabe
Type of orbit around an astronomical body
near the primary's celestial equator, the great circle of the imaginary celestial sphere that is coplanar with the primary's equator. A geostationary orbit
Near-equatorial_orbit
Small constellation in the southern celestial hemisphere
Sobiescianum by Johannes Hevelius in 1684. Located just south of the celestial equator, its four brightest stars form a narrow diamond shape. It is one of
Scutum_(constellation)
Non-periodic comet
sunset sky with a solar elongation of 42 degrees. It crossed the celestial equator on 2 November 2025. Between 15 September and 12 October 2025, observations
C/2025_A6_(Lemmon)
Topics referred to by the same term
may refer to: Cetus (constellation), a constellation straddling the celestial equator Cetus (mythology), the monster sent to devour Andromeda which was
Cetus
Atmospheric illumination by the Sun below the horizon
range of dates when the Sun is more than 18 degrees north of the Celestial equator, so it is more than 18 degrees below the horizon as seen from the
Twilight
Constellation in the southern celestial hemisphere
Lepus is a constellation lying just south of the celestial equator. Its name is Latin for hare. It is located below—immediately south—of Orion (the hunter)
Lepus_(constellation)
Topics referred to by the same term
to: Equinox (celestial coordinates), either of two places on the celestial sphere at which the ecliptic intersects the celestial equator Equinox (comics)
Equinox_(disambiguation)
Rotation of Earth around its axis
onto the celestial equator causes the Sun to move through a greater angle than usual. Conversely, near an equinox the projection onto the equator is shorter
Earth's_rotation
Landolt, Arlo U. (2009). "UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions". The Astronomical Journal. 137 (5): 4186–4269
List_of_brightest_stars
Celestial coordinate system
Earth's celestial equator used for the coordinates of poles. This large inclination means that the declination of a pole relative to Earth's celestial equator
Poles_of_astronomical_bodies
Hindu text on astrology
Astrological sign Axial tilt Azimuth Cardinal direction Celestial equator Celestial sphere Celestial spheres Center of mass Circular orbit Deferent and epicycle
Vedanga_Jyotisha
Third planet from the Sun
apparent motion of celestial bodies in Earth's sky is to the west at a rate of 15°/h = 15'/min. For bodies near the celestial equator, this is equivalent
Earth
Visible star that is nearly aligned with Earth's axis of rotation
space portal Solar System portal Astronomy on Mars § Celestial poles and ecliptic Celestial equator Direction determination Empirical evidence for the spherical
Pole_star
Kreutz sungrazer comet
brightened to an apparent magnitude of about 10. It will cross the celestial equator on 30 March 2026. Due to its relatively low declination in the sky
C/2026_A1_(MAPS)
Spherical geometry analog of a straight line
Some examples of great circles on the celestial sphere include the celestial horizon, the celestial equator, and the ecliptic. Great circles are also
Great_circle
Horizontal angle from north or other reference cardinal direction
along the celestial equator, the angles are called right ascension if referenced to the Vernal Equinox, or hour angle if referenced to the celestial meridian
Azimuth
Emission and reflection nebula in the constellation Auriga
north of the celestial equator, surrounding the bluish, irregular variable star AE Aurigae. It shines at magnitude +6.0. Its celestial coordinates are
IC_405
Five-star system in the constellation Orion
names among ancient cultures. The star is located very close to the celestial equator. When Orion is near the meridian, Mintaka is the rightmost of the
Mintaka
Near-Earth asteroid
at declinations +31 to +25°. On May 18, the asteroid crossed the celestial equator at apparent magnitude 13 and entered the southern sky at around 18:00
2026_JH2
Primary directions in astrology
remains 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)
Astrological chart or diagram
astrologers has its beginning at the exact moment that the Sun crosses the celestial equator and enters the zodiacal sign of Aries. Some Western astrologers use
Horoscope
Oort cloud comet
64 AU (395 million km) from both the Sun and Earth. It crossed the celestial equator on 17 November 2025. The comet passed about 2.3 degrees southwest
C/2024_E1_(Wierzchoś)
Topics referred to by the same term
(astronomy), imaginary circle in a plane perpendicular to the planes of the celestial equator and horizon Central meridian (astronomy) Meridian (geography), a longitude
Meridian
Line between the poles with the same longitude
declination of major stars are their angles north and south from the celestial equator. The meridian passage will not occur exactly at 12 hours because of
Meridian_(geography)
3-D coordinate system centered on the Earth
can be aligned with the Earth's celestial equator, the ecliptic, or the Milky Way's galactic equator. These 3D celestial coordinate systems add actual distance
Earth-centered, Earth-fixed coordinate system
Earth-centered,_Earth-fixed_coordinate_system
Constellation in the northern celestial hemisphere
Equuleus is a faint constellation located just north of the celestial equator. Its name is Latin for "little horse", a foal. It was one of the 48 constellations
Equuleus
Monogram for Jesus Christ
like the letter Chi, possibly referring to the ecliptic crossing the celestial equator: And thus the whole mixture out of which he cut these portions was
Christogram
Galaxy containing the Solar System
path of the Sun in the sky). It is tilted at an angle of 63° to the celestial equator. Naked eye viewing of the Milky Way as a band across the sky is based
Milky_Way
Constellation straddling the celestial equator
Constellation straddling the celestial equator
Cetus_(constellation)
Astronomical catalogue of deep sky objects
Catalogue of Nebulae and Clusters of Stars. Objects south of the celestial equator are catalogued somewhat less thoroughly, but many were included based
New_General_Catalogue
Kuiper belt object
of Varuna's equator) and the negative declination indicating that Varuna's north pole points downwards, 65° south of the celestial equator. Haumea's dimensions
20000_Varuna
Angle the planets make to each other in the horoscope
aspects which refer to degrees of declination above or below the Celestial Equator. They are not widely used by astrologers. A The same declination of
Astrological_aspect
Pattern of stars recognized on Earth's night sky
name derives from both the shape and, because the stars straddle the Celestial Equator, it is more easily seen from south of the Mediterranean than in Europe
Asterism_(astronomy)
Red dwarf star in the constellation Aquarius
TRAPPIST-1 is in the constellation Aquarius, five degrees south of the celestial equator. It is a relatively close star located 40.66±0.04 light-years from
TRAPPIST-1
CELESTIAL EQUATOR
CELESTIAL EQUATOR
Male
Italian
Italian and Spanish form of Latin Cælestinus, CELESTINO means "heavenly."
Boy/Male
Indian, Sanskrit
Celestial
Female
Italian
Feminine form of Italian/Spanish Celestino, CELESTINA means "heavenly."
Girl/Female
Tamil
Celestial
Female
English
English form of French Célestine, CELESTINE means "heavenly."
Girl/Female
Spanish Latin French
Heavenly.
Boy/Male
Indian, Sanskrit
Celestial
Boy/Male
Indian, Sanskrit
Celestial
Girl/Female
French American Latin
This French name is based on the Latin 'caelestis' meaning 'heavenly'. Used as both a masculine...
Boy/Male
Tamil
Celestial
Girl/Female
Hindu, Indian, Kannada, Marathi, Sindhi, Tamil, Telugu
Celestial
Girl/Female
French American Latin
Heavenly.
Girl/Female
Tamil
Celestial
Boy/Male
French
This French name is based on the Latin caelestis meaning 'heavenly'. Used as both a masculine and...
Girl/Female
Hindu
Celestial
Boy/Male
Gujarati, Hindu, Indian, Kannada
Celestial
Girl/Female
French Latin
Heavenly.
Girl/Female
Indian, Sanskrit
Celestial
Boy/Male
French
This French name is based on the Latin 'caelestis' meaning 'heavenly'. Five popes have been named...
Boy/Male
Bengali, Christian, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Tamil, Telugu
Celestial
CELESTIAL EQUATOR
CELESTIAL EQUATOR
Boy/Male
Tamil
Assertive
Boy/Male
Indian
Morning star, Always victorious, Warrior, Prosperous
Boy/Male
Australian, Parsi
Unpopulated; Uninhabited
Girl/Female
Biblical
A mulberry-tree.
Female
English
Feminine form of English unisex Kelly, KELLEIGH means "bright-headed."
Boy/Male
Hindu, Indian, Marathi
A King
Boy/Male
Egyptian
Brother of twins.
Girl/Female
Hindu, Indian
One Filled with Knowledge
Boy/Male
Irish
Spear-bearer.
Boy/Male
Hindu, Indian, Marathi
Ray of the Sun
CELESTIAL EQUATOR
CELESTIAL EQUATOR
CELESTIAL EQUATOR
CELESTIAL EQUATOR
CELESTIAL EQUATOR
a.
Of or pertaining to the spiritual heaven; heavenly; divine.
v. t.
To make celestial.
adv.
In a celestial manner.
v. t.
To make like heaven.
n.
A chief angel; one high in the celestial hierarchy.
n.
A description of celestial phenomena, as rainbows, etc.
n.
A native of China.
n.
Alt. of Celestinian
n.
Alt. of Celestite
n.
Native strontium sulphate, a mineral so named from its occasional delicate blue color. It occurs crystallized, also in compact massive and fibrous forms.
a.
Of or pertaining to the heavens; celestial; astronomical.
n.
The angular distance of a celestial object below the horizon.
n.
One of the orders of the celestial hierarchy.
a.
Human; not celestial; not spiritual or divine.
n.
Theology founded on observation or knowledge of the celestial bodies.
n.
An elevation of mind to things celestial.
a.
Pertaining to the firmament; celestial; being of the upper regions.
a.
Higher than celestial; superangelic.
a.
Belonging to the aerial regions, or visible heavens.
n.
An inhabitant of heaven.