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Outdated measure of planetary orbits
Equant (or punctum aequans) is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of the planets
Equant
Heliostatic model of solar system by Nicolaus Copernicus
alternative to the longstanding Ptolemaic model that purged astronomy of the equant in order to satisfy the philosophical ideal that all celestial motion must
Copernican_heliocentrism
French business services corporation
rebranding and consolidation of the existing France Telecom businesses of Equant and Wanadoo. Orange Business also acquired the companies Business & Decision
Orange_Business
Superseded description of the Universe with Earth at the center
much as 30 degrees. To alleviate the problem, Ptolemy developed the equant. The equant was a point near the center of a planet's orbit where, if you were
Geocentrism
Planetary motions in archaic models of the Solar System
called the equant (Ptolemy did not give it a name). It was the angular rate at which the deferent moved around the point midway between the equant and the
Deferent_and_epicycle
Radical shift in Western cosmology
epicycles to replace the equant, one per planet. Because this made the motion uniform in each Copernican circle, the anti-equant aesthetic was satisfied
Copernican_Revolution
Book by Johannes Kepler (1609)
and Copernicus had two different explanations for this. Ptolemy used an equant and eccentric circle, whereas Copernicus realized that he could combine
Astronomia_nova
Systematic endeavour to gain knowledge
16th-century astronomers believed that Copernicus' elimination of the equant was his chief achievement but his model never displaced Ptolemy's, which
Science
Persian astronomer (1201–1274)
circular motions. He used this technique to replace Ptolemy's problematic equant for many planets, but was unable to find a solution to Mercury, which was
Nasir_al-Din_al-Tusi
Greco-Roman astronomer and geographer (c. 100–170)
designing concurrent, real-time, embedded systems Ptolemy Slocum, actor Equant Messier 7 – Ptolemy Cluster, star cluster described by Ptolemaeus Pei Xiu
Ptolemy
Indian mathematician-astronomer (476–550)
Hindu Astronomy", in David A. King and George Saliba, ed., From Deferent to Equant: A Volume of Studies in the History of Science in the Ancient and Medieval
Aryabhata
to use the concept of Tusi couple to replace the "equant" concept in Ptolemic model. Since the equant concept would result in the Moon distance to change
Astronomy in the medieval Islamic world
Astronomy_in_the_medieval_Islamic_world
Mathematical device
the inferior planets and later used extensively as a substitute for the equant introduced over a thousand years earlier in Ptolemy's Almagest. The translation
Tusi_couple
infinitesimal geometry. His reformed model was the first to reject the equant and eccentrics, separate natural philosophy from astronomy, free celestial
Cosmology_in_the_Muslim_world
Ancient Greek analogue astronomical computer
Ptolemy published his Almagest (particularly by adding the concept of the equant to his theory), then much later by the introduction of Kepler's laws of
Antikythera_mechanism
Period of cultural flourishing from 786 to 1258
were eccentric, and the angular motion of a planet was uniform around the equant which was a point opposite the deferent center. Simply, Ptolemy's models
Islamic_Golden_Age
Mineral
14) Identification Color Colorless, yellowish, brownish Crystal habit Equant or stout prismatic crystals Twinning e {101} twin plane Cleavage {101} good
Whewellite
Nacional de Telecomunicaciones 123 E-Newcarrier.com Chile 114 ENTEL 123 Equant Chile 125 Globus 120 GSP Chile 124 Heilsberg 116 Impsat Chile 170 Manquehue
Carrier selection codes in Chile
Carrier_selection_codes_in_Chile
Telefónica del Sur 122 Gtd Manquehue 123 Entel Larga Distancia 124 GSP Chile 125 Equant Chile 127 Sur Telecomunicaciones 151 Astro 153 STEL-CHILE S.A 154 MiCarrier
Telephone_numbers_in_Chile
A large, sharp, equant, translucent, yellow, spinel-twinned or macle twinned Diamond (Super macle twinned Diamond)from Akwatia Diamond Mine and Birim Diamond
Gold_mining_in_Ghana
Elements of some cosmological models
spheres for Venus, Mars, Jupiter, and Saturn with epicycle, eccentric deferent and equant point. Georg von Peuerbach, Theoricae novae planetarum, 1474.
Celestial_spheres
Angle between the rotational axis and orbital axis of a body
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Axial_tilt
Mathematician and astronomer (1473–1543)
Ptolemy's system employed devices, including epicycles, deferents and equants, to account for observations that the paths of these bodies differed from
Nicolaus_Copernicus
German astronomer and mathematician (1571–1630)
calculated and recalculated various approximations of Mars's orbit using an equant (the mathematical tool that Copernicus had eliminated with his system),
Johannes_Kepler
Mineral
Color Amber, lemon- or sulfur yellow Crystal habit Commonly as tabular equant, to short prismatic crystals; rarely in microcrystalline aggregates Cleavage
Schoepite
Extinct genus of reptiles
individual, from "thumb" to fifth "finger", is 4-8-9-8-6. The pelvis includes equant pubic bones, ischia, and blade-shaped ilia connecting the pelvis to the
Plesiosaurus
Arab astronomer (c1200–1266)
an equant in an astronomic model to be replaced with an equivalent epicycle that moved around a deferent centered at half the distance to the equant point
Mu'ayyad_al-Din_al-Urdi
Planetary hypothesis proposed by Johannes Kepler
describe the motion of Mars. The hypothesis adopted the circular orbit and equant of Ptolemy's planetary model as well as the heliocentrism of the Copernican
Vicarious_Hypothesis
Fe(II) phosphate mineral
parallel to the c-crystal axis, and flattened perpendicular to the b-axis. Equant crystals are rarer. They may also occur as stellate (star-shaped) groups
Vivianite
+882 and +883, non-country-specific calling codes
Network +882-22 Cable & Wireless Global Network +882-23 SITA-Equant Joint Venture Sita-Equant Network +882-28 Deutsche Telekom Next Generation Network +882-31
International Networks (country code)
International_Networks_(country_code)
Black; medium gray in reflected light Crystal habit Subhedral or anhedral; equant or platelike; up to 150 μm Cleavage None Luster Metallic Streak Dark reddish
Fingerite
Crystalline chemical element or compound formed by geologic processes
(tree-pattern) is common in native copper or native gold with a groundmass (matrix); equant, which is typical of garnet; prismatic (elongated in one direction) as seen
Mineral
List of important events in the history of astronomy
published the Tarik al-Aflak. In his work, he indicated the so-called "equant" problem of the Ptolemic model. Al-Juzjani even proposed a solution to the
Timeline_of_astronomy
Family of proprietary audio codecs owned by Qualcomm
is a member of the Audio Engineering Society (aes.org) "BA cuts stake in Equant". TheGuardian.com. December 23, 1999. Retrieved September 28, 2019.{{cite
AptX
French multinational telecommunications corporation
Télécom also bought stakes in several other international firms (GlobalOne, Equant, Internet Telecom, Freeserve, EresMas, NTL and Mobilcom), of which some
Orange_Group
Work of astronomers and mathematicians at the University of Wittenberg
by Copernicans ability to remove the equant in his theory of the cosmos. This new idea, the rejection of the equant, is the source of Reinhold’s praise
Wittenberg interpretation of Copernicus
Wittenberg_interpretation_of_Copernicus
First planet from the Sun
model for the appearances of Mercury, showing the multiplication of epicycles using the Tusi couple, thus eliminating the Ptolemaic eccentrics and equant.
Mercury_(planet)
Scale model of a celestial body
geocentric models, such as Ptolemy’s 2nd-century system using epicycles and equants to explain planetary motion. Medieval astronomers, influenced by his work
Globe
Arab physicist, mathematician and astronomer (c. 965 – c. 1040)
mathematical devices Ptolemy introduced into astronomy, especially the equant, failed to satisfy the physical requirement of uniform circular motion,
Ibn_al-Haytham
even his order of presentation. Yet, in order to purge astronomy of the equant—which violated the theological and philosophical ideal that all celestial
Science_in_the_Renaissance
Sun-centered astronomical model
planetary models as found in Arabic sources. The exact replacement of the equant by two epicycles used by Copernicus in the Commentariolus was found in an
Heliocentrism
Apparent path of the Sun on the celestial sphere
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Ecliptic
Hindu text on astrology
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Vedanga_Jyotisha
Mineral species
more than about 7 cm (2.8 in) in their widest dimension—and tabular or equant in habit, and few in number, most being heavily included with growth tubes
Pezzottaite
A large, sharp, equant, translucent, yellow, spinel-twinned or macle twinned Diamond (Super macle twinned Diamond)from Akwatia Diamond Mine and Birim Diamond
Mining_industry_of_Ghana
Сyclosilicate mineral
72 ų Identification Color Colorless, Light pink Crystal habit Roughly equant barrel-shaped prismatic crystals Cleavage None Fracture Conchoidal, splintery
Poudretteite
Muslim-ruled parts of the Iberian Peninsula (711–1492)
works on critiquing and revising Ptolemaic astronomy and the problem of the equant in his astronomical model. Instead, they accepted Aristotle's model and
Al-Andalus
American historian (1912-2009)
publications King, David A., & Saliba, George (eds.), From Deferent to Equant: A Volume of Studies in the History of Science in the Ancient and Medieval
Edward_Stewart_Kennedy
Family of minerals
Identification Color Honey-yellow, reddish brown Crystal habit Tabular to equant striated crystals, deep grooves may resemble thin plates stack, oriented
Bastnäsite
epicycles to replace the equant, one per planet. Because this made the motion uniform in each Copernican circle, the anti-equant aesthetic was satisfied
History_of_Europe
Scientific study of the origin, evolution, and eventual fate of the universe
eccentric or a deferent) around a center-point near Earth. The use of equants added another level of complexity and allowed astronomers to predict the
Cosmology
Manganese phosphate mineral
colourless Crystal habit Crystals are short prismatic parallel to (100) or equant, sometimes thick tabular, also massive or imperfectly fibrous Cleavage {100}
Hureaulite
Ptolemaic astronomy, showing a planet on an epicycle (smaller dashed circle), a deferent (larger dashed circle), the eccentric (×) and an equant (•).
Discovery and exploration of the Solar System
Discovery_and_exploration_of_the_Solar_System
Arab astronomer and clockmaker (1304–1375)
His model incorporated the Urdi lemma, and eliminated the need for an equant (a point on the opposite side of the center of the larger circle from the
Ibn_al-Shatir
Indian telecommunications company
group's business services operations and rebranded its existing operations of Equant and Wanadoo to a new entity – 'Orange Business Services' (informally, OBS)
Orange Business Services India
Orange_Business_Services_India
16th-century astronomers believed that Copernicus' elimination of the equant was his chief achievement but his model never displaced Ptolemy's, which
History_of_science
Halide mineral
Color Sulfur-yellow, greenish yellow, brown Crystal habit Aggregates of equant to elongated crystals, powdery, massive Cleavage Perfect on [101] Tenacity
Terlinguaite
Topics referred to by the same term
staff notation An uncategorized celestial object in the galaxy NGC 4945 Equant, punctum aequans, is a mathematical concept developed by Claudius Ptolemy
Punctum
Thin slice of a material prepared for microscopic examination
is colorless with low relief and no cleavage. Its habit is either fairly equant or anhedral if it infills around other minerals as a cement. Under cross
Thin_section
models for Jupiter, Saturn, and Mars included the center of the circle, the equant point, the epicycle, and an observer from Earth to give perspective. The
Ancient_Greek_astronomy
Mercury chloride mineral
to ash-grey, brown Crystal habit Crystals commonly tabular to prismatic, equant pyramidal; common as drusy crusts, earthy, massive. Twinning Contact and
Calomel
Sulfate mineral
bluish green, or reddish due to inclusions Crystal habit Prismatic to equant crystals, granular, massive Fracture Conchoidal Tenacity Brittle Mohs scale
Blödite
Astronomy in Ancient Egypt
behavior of the planets with the introduction of a new mathematical idea, the equant. A few mathematicians of late Antiquity wrote commentaries on the Almagest
Egyptian_astronomy
UNESCO World Heritage Site in Jaipur
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Jantar_Mantar,_Jaipur
motion does not apply to the Sun. His main contribution to the model was the equant points. He also re-arranged the heavenly spheres in a different order than
Historical models of the Solar System
Historical_models_of_the_Solar_System
Halide mineral
Crystal habit Usually massive, coarsely granular. The rare crystals are equant and pseudocubic. Twinning Very common, often repeated or polysynthetic with
Cryolite
Sanskrit text on Indian astronomy
Part 2, No. 176, pages 229-235 with footnotes Duke, Dennis (2005). "The Equant in India: The Mathematical Basis of Ancient Indian Planetary Models". Archive
Surya_Siddhanta
Hypothetical planet on the other side of the Sun from Earth
Celestial spheres Circle of latitude Counter-Earth Deferent and epicycle Equant Geocentrism Heliocentrism Hipparchic cycle Inferior and superior planets
Counter-Earth
Natural material created during volcanic eruptions
vesicle-wall fragments while lithic fragments in volcanic ash are typically equant, or angular to subrounded. Lithic morphology in ash is generally controlled
Volcanic_ash
to splendent luster. It crystallizes in the trigonal crystal system as equant, distorted prisms with trigonal pyramid terminations. It occurs as rare
Povondraite
Sanskrit astronomical treatise by Aryabhata
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Aryabhatiya
Fossil pollen organ of seed fern
Pteruchus africanus differ from other species of Pteruchus in small size, and equant blade supporting the pollen sacs. Pteruchus africanus may have been produced
Pteruchus_africanus
Table of positions of astronomical objects at given times
of computing apparent planetary positions (it avoided the need for the equant and better explained the apparent retrograde motion of planets), it still
Ephemeris
Medieval Arab astrologer
Deferent and epicycle Earth's rotation Eccentricity Ecliptic Elliptic orbit Equant Galaxy Geocentrism Gravitational energy Gravity Heliocentrism Inertia Islamic
Abu_Ali_al-Khayyat
Volcanic eruption involving both steam and magma
mechanisms across a wide range of compositions, basic and acidic. Blocky and equant clasts with low vesicle content are formed. The deposits of phreatomagmatic
Phreatomagmatic_eruption
Polish academic and diplomat (c. 1445 - c. 1497)
a figure) also take the equable angular motion round the centre of the equant into account, which centre lies on the point of the circumference of the
Albert_Brudzewski
Heptahydrated iron(II) sulfate
colorless Crystal habit Encrustations and capillary efflorescences; rarely as equant pseudo-octahedral, prismatic or tabular crystals Cleavage {001} Perfect
Melanterite
Mafic intrusive igneous rock composed predominantly of plagioclase
anorthosite bodies. Their most characteristic feature is the presence of equant, euhedral megacrysts (up to 30 cm) of plagioclase surrounded by a fine-grained
Anorthosite
Observatory in Varnasi, India
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Jantar_Mantar,_Varanasi
Italian businessman
been a member of the boards of directors of multinational groups including Equant (1997-2000), Motorola in the United States (2000-2003), Invensys in the
Francesco_Caio
A large, sharp, equant, translucent, yellow, spinel-twinned or macle twinned Diamond (Super macle twinned Diamond)from Akwatia Diamond Mine and Birim Diamond
Economy_of_Ghana
Lunar mansion in Hindu astronomy
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Nakshatra
Mineral
Pink color fades on exposure to sunlight Crystal habit Usually tabular or equant to prismatic; commonly massive, often compact and fibrous Twinning Rare
Bustamite
epicycles to replace the equant, one per planet. Because this made the motion uniform in each Copernican circle, the anti-equant aesthetic was satisfied
Science and the Catholic Church
Science_and_the_Catholic_Church
Sixth month of the Hindu lunar calendar
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Bhadrapada
Symbol of fate in medieval and ancient philosophy
spheres for Venus, Mars, Jupiter, and Saturn with epicycle, eccentric deferent and equant point. Georg von Peuerbach, Theoricae novae planetarum, 1474.
Wheel_of_Fortune_(medieval)
Orthorhombic anhydrous vanadate hydroxide mineral
also encrustations and mammillary or botryoidal surfaces. The crystals are equant dipyramids or prisms parallel to the c crystal axis, but always microscopic
Mottramite
Astronomical treatise by Claudius Ptolemy
where Hipparchus had failed, by introducing a third device called the equant. Ptolemy wrote the Syntaxis as a textbook of mathematical astronomy. It
Almagest
Crystalline mineral
calcite grains Green oxide of chromium from Baltimore, Maryland Large, equant chromite crystals from Hangha, Kenema District, Eastern Province, Sierra
Chromite
Historical place in New Delhi
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Jantar_Mantar,_New_Delhi
Magnesium-rich igneous rock
flowing liquid melt B2 – Olivine adcumulate composed of >93% interlocking equant olivine crystals B3 – Lower chill margin composed of olivine adcumulate
Komatiite
Astronomical calculating instrument
of Rome. A unique example of Medieval Equatorium". "Third Solution: The Equant Point - SliderBase". www.sliderbase.com. Retrieved 2018-05-09. "the definition
Equatorium
Mercury(II) oxide mineral, HgO
Identification Color Deep red, brownish red to brown Crystal habit Long prismatic, equant, rarely flattened; striated; massive to vermicular clusters Cleavage Perfect
Montroydite
British historian and author
Scientific Manuscripts In The Egyptian National Library From Deferent to Equant: A Volume of Studies on the History of Science of the Ancient & Medieval
David_A._King_(historian)
adequality, adequate, disequilibrium, equable, equal, equality, equanimity, equant, equation, equational, equative, equator, equatorial, equilibrium, equitable
List of Latin words with English derivatives
List_of_Latin_words_with_English_derivatives
French businessman and politician (born 1955)
acquisition strategy that included mobile phone operator Orange, data carrier Equant and Internet service provider (ISP) Freeserve as well as several new, third-generation
Thierry_Breton
Indian mathematician-astronomer-astrologer (505–587)
Circular orbit Deferent and epicycle Earth's rotation Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of
Varāhamihira
Star charts arranged on a globe
conceived as circular with respect to a point displaced from Earth), and equants (a device that posits a constant angular rate of rotation with respect
Celestial_globe
Triclinic lead copper chromate mineral
66°, γ = 108.5°; Z = 1 Identification Color Brown to orange Crystal habit Equant to flattened euhedral crystals Mohs scale hardness 3 Luster Vitreous Streak
Iranite
1543 book by Copernicus describing his heliocentric theory of the universe
at the beginning of the book and were only interested in Copernicus' new equant-free models of planetary motion in the later chapters. Also, Nicolaus Reimers
De revolutionibus orbium coelestium
De_revolutionibus_orbium_coelestium
EQUANT
EQUANT
EQUANT
EQUANT
Boy/Male
Armenian
Boy/Male
Greek Spanish Latin
Lion.
Girl/Female
Indian
Pretty, Beautiful
Male
Swiss
, bay or laurel tree.
Girl/Female
Tamil
Anushiya | அநà¯à®·à¯€à®¯à®¾Â
Brave and sweet, Beauty
Boy/Male
Hindu
Girl/Female
Hindu, Indian
Moon
Boy/Male
Arabic
Strongest Man
Female
Egyptian
, the mother of the chancellor Psametik.
Boy/Male
Australian, Gaelic
Son of the Fair-skinned One
EQUANT
EQUANT
EQUANT
EQUANT
EQUANT
n.
A circle around whose circumference a planet or the center of ann epicycle was conceived to move uniformly; -- called also eccentric equator.