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Apparent backward motion of a planet
Apparent retrograde motion is the apparent motion of a planet in a direction opposite to that of other bodies within its system, as observed from a particular
Apparent_retrograde_motion
Topics referred to by the same term
Apparent motion may refer to: Aberration of light, an apparent shift in position of celestial objects due to the finite speed of light and the motion
Apparent_motion
Apparent motion of celestial objects around Earth
In astronomy, diurnal motion (from Latin diurnus 'daily', from Latin diēs 'day') is the apparent motion of celestial objects (e.g. the Sun and stars)
Diurnal_motion
Optical illusion in which a static image appears to be moving
The term illusory motion, or motion illusion or apparent motion, refers to any optical illusion in which a static image appears to be moving due to the
Illusory_motion
Apparent path of the Sun on the celestial sphere
invariable plane, and because the ecliptic is well defined by the apparent motion of the Sun, the ecliptic is used as the reference plane of the Solar
Ecliptic
Psychophysics concept
psychophysics, Korte's third law of apparent motion is an observation relating the phenomenon of apparent motion to the distance and duration between
Korte's third law of apparent motion
Korte's_third_law_of_apparent_motion
Optical illusion of apparent motion
The term phi phenomenon is used in a narrow sense for an apparent motion that is observed if two nearby optical stimuli are presented in alternation with
Phi_phenomenon
Calculation of elapsed time by the apparent position of the sun
hours. The apparent sun is the true sun as seen by an observer on Earth. Apparent solar time or true solar time is based on the apparent motion of the actual
Solar_time
Work by Copernicus
their apparent daily motion is caused by the daily rotation of the Earth. The Earth is moved in a sphere around the Sun, causing the apparent annual
Commentariolus
Optical illusion of motion
The term beta movement is used for the optical illusion of apparent motion in which the very short projection of one figure and a subsequent very short
Beta_movement
Type of long exposure photograph
photograph that uses long exposure times to capture diurnal circles, the apparent motion of stars in the night sky due to Earth's rotation. A star-trail photograph
Star_trail
Phenomenon wherein objects appear to move about their true positions in the sky
velocity aberration) is a phenomenon where celestial objects exhibit an apparent motion about their true positions based on the velocity of the observer: It
Aberration_(astronomy)
Apparent faster-than-light motion of distant astronomical objects
at high velocities. Light echoes can also produce apparent superluminal motion. Superluminal motion occurs as a special case of a more general phenomenon
Superluminal_motion
Term in English for counter-clockwise
keeping it on the left. Literally, it describes a course opposite the apparent motion of the sun viewed from the Northern Hemisphere (the face of this imaginary
Widdershins
Greek astronomer, geographer and mathematician (c. 190 – c. 120 BCE)
not at the center of the Sun's motion, but at some distance from the center. This model described the apparent motion of the Sun fairly well. It is known
Hipparchus
Optical illusion
The color phi phenomenon is the fact that, when apparent motion is induced between objects with different colors, the color of the apparently moving object
Color_phi_phenomenon
First planet from the Sun
apparent motion of the Sun in Mercury's sky is relatively rapid. These points, which are the ones on the equator where the apparent retrograde motion
Mercury_(planet)
Star in the constellation Serpens
reaching an apparent magnitude of about −2.7. The star's proper motion will peak around one arcminute per year, a rate of apparent motion that would be
Gliese_710
Direction the Sun travels relative to local standard of rest
local standard of rest. This is not to be confused with the Sun's apparent motion through all constellations of the zodiac, which is an illusion caused
Solar_apex
Planetary motions in archaic models of the Solar System
speed and direction of the apparent motion of the Moon, Sun, and planets. In particular it explained the apparent retrograde motion of the five planets known
Deferent_and_epicycle
Latin phrase meaning "it is solved by walking"
his eight line poem "Motion" (1825), with further reference to the apparent motion of the sun in a seeming contrast to Galileo's heliocentric system.
Solvitur_ambulando
Rotation of a satellite as it orbits
The apparent motion of the Sun is approximately +1° per day (360° per year / 365.2422 days per tropical year ≈ 0.9856473° per day), so apparent motion of
Nodal_precession
Diagrammatic representation of Sun's position over a period of time
ecliptic, i.e., about 47°. The component along this axis of the Sun's apparent motion is a result of the familiar seasonal variation of the declination of
Analemma
Sensation
similar sensation of falling can be induced when the eyes detect rapid apparent motion with respect to the environment. This system enables people to keep
Falling_(sensation)
Illusion of apparent movement
effect is an illusion related to human visual perception involving apparent motion. In a simplified explanation of one form of the illusion, two discs
Ternus_illusion
Reference star used by telescopes for tracking purposes
accurately maintain the tracking by a telescope of a celestial body, whose apparent motion through the sky is primarily due to Earth's rotation. Accurate telescope
Guide_star
Time-telling device
The principles of sundials are understood most easily from the Sun's apparent motion. The Earth rotates on its axis, and revolves in an elliptical orbit
Sundial
Length of time
by the apparent motion of the Sun against the starry background. It is the Earth's orbital motion about the Sun which causes this apparent motion to occur
Great_Year
French astronomer (1605–1694)
planetary motion must be between the points of true and apparent motion. Since the equal motion in the first quadrant is greater than the apparent motion, that
Ismaël_Bullialdus
Semi-annual astronomical event where the Sun is directly above the Earth's equator
Pole about 7 days longer than that at the South Pole. The Sun, in its apparent motion along the ecliptic crosses the celestial equator at these points, one
Equinox
Sky from planet Mercury
Mercury's orbit exactly matches its rotational velocity, so that the Sun's apparent motion stops. At perihelion, Mercury's orbital angular velocity slightly exceeds
Astronomy_on_Mercury
Apparent solar time minus mean solar time
solar time. The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun, and mean solar time, which tracks
Equation_of_time
Computer vision technique
high-speed camera, are processed to produce information based on the apparent motion in the images. In some applications, the camera is fixed relative to
Motion_analysis
Specially designed clock that keeps track of the Moon's apparent motion around the Earth
clock is a specially designed clock that keeps track of the Moon's apparent motion around the Earth. Along many coastlines, the Moon contributes the major
Tide_clock
Photography using a long-duration shutter speed
on. A star-trail photograph uses long exposure times to capture the apparent motion of stars in the night sky due to Earth's rotation. A star-trail photograph
Long-exposure_photography
Brightness of a celestial object observed from the Earth
Apparent magnitude (m) is a measure of the brightness of a star, astronomical object or other celestial objects like artificial satellites. Its value depends
Apparent_magnitude
at an arbitrary epoch, together with its actual motion over time (known as proper motion). The apparent position is its position as seen by a theoretical
Apparent_place
British physician, philologist and theologian (1779–1869)
vision theory that was later commonly, yet incorrectly, used to explain apparent motion in film and animation. Peter Mark Roget was born in Broad Street, Soho
Peter_Mark_Roget
Reference frame that undergoes acceleration with respect to an inertial frame
acceleration. While the laws of motion are the same in all inertial frames, they vary in non-inertial frames, with apparent motion depending on the acceleration
Non-inertial_reference_frame
the tentative target displays a very small amount of apparent motion, as well as for actual motion tracking. In the first case the problem is considerably
Track-before-detect
Apparent least distance between two celestial objects
apparent distance between one celestial object and another, as seen from a third body during a given period. Appulse is seen in the apparent motion typical
Appulse
System for organizing days
calendars are based on perceived seasonal changes synchronized to the apparent motion of the Sun; an example is the Persian calendar. Lunisolar calendars
Calendar
Machine Akiyoshi's illusion pages Professor Akiyoshi KITAOKA's anomalous motion illusions Spiral Or Not? by Enrique Zeleny, Wolfram Demonstrations Project
List_of_optical_illusions
Outermost moving sphere in the geocentric model of the universe
universe. The concept was introduced by Ptolemy to account for the apparent daily motion of the heavens around the Earth, producing the east-to-west rising
Primum_Mobile
Hypothesized astronomical system
contained the insight that "the apparent motion of the heavenly bodies" was (in large part) due to "the real motion of the observer". How much of the
Pythagorean astronomical system
Pythagorean_astronomical_system
Twenty-first letter in the Greek alphabet
the phi phenomenon is the apparent motion caused by the successive viewing of stationary objects, such as the frames of a motion picture. In linguistics
Phi
English astronomer (1692–1762)
annual cyclical motion of the apparent position of the star. However, while Bradley and Molyneux did not find the expected apparent motion due to parallax
James_Bradley
binoculars are binoculars that have a mechanism for decreasing the apparent motion of the view due to binocular movement. Such binoculars are designed
Image-stabilized_binoculars
Period of time for the ecliptic longitude of the Sun to increase 360°
"turn" in its annual seasonal motion. Because of this connection between the tropics and the seasonal cycle of the apparent position of the Sun, the word
Tropical_year
Pattern of motion in a visual scene due to relative motion of the observer
optic flow is the pattern of apparent motion of objects, surfaces, and edges in a visual scene caused by the relative motion between an observer and a scene
Optical_flow
Savage-Smith. Some medieval Muslims took an interest in the study of the apparent motion of the stars. This was partly because they considered the celestial
Islam_and_astrology
Speed of electromagnetic waves
demonstrated that light does not travel instantaneously by studying the apparent motion of Jupiter's moon Io. In an 1865 paper, James Clerk Maxwell proposed
Speed_of_light
Visual artifact that depicts or records perception
electronic formats such as television and digital image displays, the apparent "motion" is actually the result of many individual lines giving the impression
Image
Solar tracking device
reflects sunlight toward a target, turning to compensate for the Sun's apparent motion. The reflector is usually a plane mirror. The target may be a physical
Heliostat
Star opposite Jupiter in Chinese zodiac
the Jovian orbital cycle, rather than as in the western zodiac—the apparent motion of the sun relative to the celestial sphere. The star thought to oppose
Tai_Sui
When sun appears directly over equator
into) a 'corner' of Cetus at 0°10′ distance in the year 1489. In its apparent motion on the day of an equinox, the Sun's disk crosses the Earth's horizon
March_equinox
Time of day when the sun appears above the horizon
Earth's motion that causes the Sun to appear. The illusion of a moving Sun results from Earth observers being in a rotating reference frame; this apparent motion
Sunrise
Twice-annual astronomical event when the Sun is farthest from above the Earth's equator
time applied by Isaac Newton prevailed. The motion of the Sun across the sky is still called "apparent motion" in celestial navigation in deference to the
Solstice
Topics referred to by the same term
planet etc. to move from its rising to its setting point Diurnal motion, the apparent motion of stars around the Earth Diurnal chart, a chart for a given
Diurnal
Concept in Hindu astrology
other than the Sun and the Moon that appear to move backwards, which apparent motion is due to Earth’s orbit. Vakri in Sanskrit means twisted or crooked;
Vakri_grahas
Rotation of Earth around its axis
Earth rotates about its axis daily and that the apparent movement of the stars is a relative motion caused by the rotation of the Earth. He provided
Earth's_rotation
Wind experienced by a moving object
Apparent wind is the wind experienced by a moving object. The apparent wind is the wind experienced by an observer in motion and is the relative velocity
Apparent_wind
Topics referred to by the same term
exchanged between internet service providers Transit (astronomy), the apparent motion of one celestial body across the face of another celestial body or
Transit
Time standard
data from Newcomb's Tables of the Sun (based on the theory of the apparent motion of the Sun by Simon Newcomb, 1895, as retrospectively used in the definition
Dynamical_time_scale
Sufficient evidence/argument for truth
chance. Proofs need not be verbal. Before Copernicus, people took the apparent motion of the Sun across the sky as proof that the Sun went round the Earth
Proof_(truth)
Device to demonstrate Earth's rotation
role in defining the inertial frame, suggesting that the pendulum's apparent motion might be influenced by the collective gravitational effect of these
Foucault_pendulum
Change in the position of an object
high velocities. Light echoes can also produce apparent superluminal motion. This occurs owing to how motion is often calculated at long distances; oftentimes
Motion
Electronic astronomical tool
within the telescope's field of view during the whole exposure; any apparent motion would cause point sources of light (such as stars) to appear as streaks
Autoguider
Scale model of a celestial body
feature marked on them: a diagram called the analemma, which shows the apparent motion of the Sun in the sky during a year. Globes generally show north at
Globe
Mechanism in a telescope's mount
mounted telescope along one axis to keep the aim in exact sync with the apparent motion of the fixed stars on the celestial sphere. Clock drives work by rotating
Clock_drive
Indian mathematician and astronomer (1114–1185)
the instantaneous motion (tātkālika gati) of the planets and distinguished it from their varying apparent motion from their mean motion(madhyama gati).
Bhāskara_II
Work being continuously done without an external input of energy
Perpetual motion is the motion of bodies that continues forever in an unperturbed system. A perpetual motion machine is a hypothetical machine that can
Perpetual_motion
Motion of Earth's rotational axis relative to its crust
gyroscope describing the apparent motion of the rotation axis about the geometric axis of the Earth. This is the so-called polar motion. Observations show that
Polar_motion
Northern pole-star; brightest star in Ursa Minor
the true azimuth of Polaris worked out for different latitudes. The apparent motion of Polaris towards and, in the future, away from the celestial pole
Polaris
Laws in physics about force and motion
Newton's laws of motion are three physical laws that describe the relationship between the motion of an object and the forces acting on it. These laws
Newton's_laws_of_motion
Topics referred to by the same term
mechanism to move a telescope to keep the aim in exact sync with the apparent motion of the fixed stars Kicked rotator, a prototype model for chaos and
Rotator
Calendar with lunar month, solar year
true apparent motion of the Sun,[citation needed] their leap months do not usually occur within a couple of months of perihelion, when the apparent speed
Lunisolar_calendar
Attraction of masses and energy
between objects at the scale of astronomical bodies, and it determines the motion of satellites, planets, stars, galaxies, and even light. Gravity is also
Gravity
Optical illusion
the same direction as the background. Induced motion has more continuous history than does apparent motion. Induced movement was reported by Ptolemy (ca
Induced_movement
Topics referred to by the same term
backwards from a target source to its original source Apparent retrograde motion, the apparent motion of planets as observed from a particular vantage point
Retrograde
Time counting system
the astrolabe and sundial and by their desire to model the Earth's apparent motion around the Sun. In Northern Europe these dials generally used the 12-hour
12-hour_clock
Book by Slavoj Žižek
dialectic from a materialist perspective. A parallax shift refers to the apparent motion of an object when it is seen from different perspectives. Using this
The_Parallax_View_(book)
Optical illusion
moving at a constant speed in front of stripes generates apparent reverse motion, this apparent motion is similar to the action of a neck when the pigeon walks
Stepping_feet_illusion
Optical illusion
PMID 6514509. S2CID 21768829. Finlay D, Dodwell P (1987). "Speed of apparent motion and the wagon-wheel effect". Percept Psychophys. 41 (1): 29–34. doi:10
Wagon-wheel_effect
Italian Dominican friar, philosopher and mathematician (1548–1600)
conserved the idea of planets fixed to solid spheres, but considered the apparent motion of the stars to be an illusion caused by the rotation of the Earth
Giordano_Bruno
Sun-centered astronomical model
(4th century BCE) said that the rotation of Earth explained the apparent daily motion of the celestial sphere. It used to be thought that he believed
Heliocentrism
Model of objects in the sky consisting of a framework of rings
the machine is equally fitted to show either the real motion of the earth, or the apparent motion of the heavens. To reset the sphere for use, one must
Armillary_sphere
Latin: with the Sun
anticyclonic motion, which is clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere (but with the sun's apparent motion when facing
Cum_sole
Argument for the existence of God
deity. Practically, however, he had presented an explanation for the apparent motion of the fixed stars. According to Aristotle's natural theology, his
Cosmological_argument
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
All points in space which project onto the same points in the retinas of both eyes
(similar in principle to the apparent motion horopter, according that identical visual directions cause no apparent motion). Other criteria used over the
Horopter
Change of rotational axis in an astronomical body
precessional motions are actual and real, whereas others are only apparent motion caused by the false perception that the background stars drift and
Axial_precession
Nausea caused by exposure to a VR environment
trigger of virtual reality sickness is when there is disparity in apparent motion between the visual and vestibular stimuli. This disparity occurs if
Virtual_reality_sickness
Computerized information extraction from images
that point is moving relative to the image plane, i.e., its apparent motion. This motion is a result of both how the corresponding 3D point is moving
Computer_vision
Calendar based on the seasons or apparent sun position
also a sidereal calendar. They are calculated on the basis of the apparent motion of the Sun through the twelve zodiacal signs rather than the tropical
Solar_calendar
Near-Earth asteroid
it was at that time moving directly towards the observer and its apparent motion across the sky was extremely slow, with a rate of 0.01 degrees/day
2019_OK
Fatigue and mood changes in response to prolonged periods of motion
or apparent motion. Acta Astronautica, 43(3-6), 181-192. Graybiel, A.; Knepton, J. (1976). "Sopite Syndrome - Sometimes Sole Manifestation of Motion Sickness"
Sopite_syndrome
Type of imaging sensor
produced by moving objects and the static scene (whose apparent motion is induced by the camera's ego-motion). Some of the recent[when?] approaches to solving
Event_camera
Surveying instrument that uses the Sun's direction instead of magnetism
compass. Application of the solar compass requires knowledge of the apparent motion of the Sun around the Earth, relative to the Earth as the center of
Burt's_solar_compass
Optical bombsight used by the Royal Navy and RAF
projecting a moving display onto a reflector sight that matched the apparent motion of the target at the right instant. The Mk. III was designed for, and
Low_Level_Bombsight,_Mark_III
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