This article is about the apparent motion of planets as observed from a particular vantage point. For retrograde motions of celestial bodies relative to a gravitationally central object, see Retrograde and prograde motion.
An animation explaining why the planet Mercury may appear to move "backwards", or retrograde across Earth's sky
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 vantage point. Direct motion or prograde motion is motion in the same direction as other bodies.
While the terms direct and prograde are equivalent in this context, the former is the traditional term in astronomy. The earliest recorded use of prograde was in the early 18th century, although the term is now less common.[1]
^"Prograde, adj". OED Online version. Oxford University Press. 2012.
and 24 Related for: Apparent retrograde motion information
Apparentretrogrademotion is the apparentmotion of a planet in a direction opposite to that of other bodies within its system, as observed from a particular...
its original source Apparentretrogrademotion, the apparentmotion of planets as observed from a particular vantage point Retrograde (album), a 2016 album...
Retrogrademotion in astronomy is, in general, orbital or rotational motion of an object in the direction opposite the rotation of its primary, that is...
speed and direction of the apparentmotion of the Moon, Sun, and planets. In particular it explained the apparentretrogrademotion of the five planets known...
astronomical phenomena of interest to astronomers are eclipses, apparentretrogrademotion/planetary stations, planetary ingresses, sidereal time, positions...
being used less consistently by commercial programs. The symbol for retrogrademotion is ℞, a capital 'R' with a tail stroke. An 'R' with a tail stroke...
seems to stop, before restarting in the other direction (see apparentretrogrademotion). This occurs because of the projection of the planet orbit into...
from east to west along its ground track, in what is called "apparentretrograde" motion. This effect occurs because the satellite orbits more slowly...
of retrogrademotion, which means it will appear to move backwards in a looping curve with respect to the background stars. This retrogrademotion lasts...
separate one for each planet. To account for apparent anomalies in this view, such as the apparentretrogrademotion of the planets, a system of deferents and...
than the sidereal day for retrograde rotation, as the rotation of the planet would be against the direction of orbital motion. If a planet rotates prograde...
17th-century Scientific Revolution, best known for his laws of planetary motion, and his books Astronomia nova, Harmonice Mundi, and Epitome Astronomiae...
fictional relationship of Elizabeth Macarthur to Dawes in particular. Apparentretrogrademotion Armillary sphere Astrarium Astrolabe Astronomical clock Clockwork...
Accidental Dignity, there are a range of Accidental Debilities, such as retrogradation, Under the Sun's Beams, Combust, and so forth. Each sign can be divided...
stationary in the sky because it had just turned retrograde that day. This apparent backward motion is created when Earth's orbit takes it past an outer...
angular momentum of the entire system. Apparentretrogrademotion is the periodic, apparently backwards motion of planetary bodies when viewed from the...
apparent rising and setting of the Sun, Moon, planets, and stars. Apparentretrogrademotion Coriolis effect International Terrestrial Reference System Celestial...
the size of the apparentretrogrademotion of all Solar System bodies except the Sun and the Moon. The equant model has a body in motion on a circular path...
on which definition of "conjunction" one uses (this is due to apparentretrogrademotion and happens within months). The most recent triple conjunction...
stationary in contrast to the geocentrism. He argued that the apparentretrogrademotion of the planets is an illusion caused by Earth's movement around...
astronomers. By the 2nd millennium BCE they were familiar with the apparentretrogrademotion of the planet, in which it appears to move in the opposite direction...
near its opposition point, 180 degrees from the Sun, where the apparentretrogrademotion for objects beyond Earth's orbit is at its strongest. He also...
focal points. This became the first of Kepler's three laws of planetary motion. From the perspective of all but the most demanding, the path of Mars is...
then. Jupiter next continued to move and then stopped in its apparentretrogrademotion on December 25 of 2 BC over the town of Bethlehem.[clarification...
Global Information