apparent retrograde motion

In particular it explained the apparent retrograde motion of the five planets known at the time.

This apparent retrograde motion, however, is seen because the Earth is moving.

Their apparent retrograde motion occurs during the transition between evening star into morning star, as they pass between Earth and the sun.

Apparent retrograde motion of the planets was explained by smaller circular orbits of individual planets.

This reversal was due to the planet's apparent retrograde motion - a phenomenon familiar to the astrologers but not necessarily noticed by the casual observer.

From Earth, Neptune goes through apparent retrograde motion every 367 days, resulting in a looping motion against the background stars during each opposition.

To account for apparent anomalies in this view, such as the apparent retrograde motion of the planets, a system of deferents and epicycles was used.

Traité des mouvements apparents des corps célestes (Treatise on apparent retrograde motion of celestial bodies), (1774)

Combined with other tablets, it starts with Jupiter's first morning rising, tracks it through its apparent retrograde motion, and finishes with its last visible setting at dusk.

Apparent retrograde motion is the westward motion of a planet with respect to the stars which occurs near opposition (outer planets) or near inferior conjunction (inner planets).

He argued that the apparent retrograde motion of the planets is an illusion caused by Earth's movement around the Sun, which the Copernican model placed at the centre of the universe.

By the 2nd millennium BCE they were familiar with the apparent retrograde motion of the planet, in which it appears to move in the opposite direction across the sky from its normal progression.

In astrological interpretations, these phrases are said to refer to apparent retrograde motion and to stationing, i.e., Jupiter appeared to reverse course for a time, then stopped, and finally resumed its normal progression.

Double sunrises, 3DS Max Animation - illustrating the case of Mercury (the animation of an imaginary apparent retrograde motion of the Sun as seen from Earth begins at 1:35)

This apparent retrograde motion of the Sun occurs because, from approximately four Earth days before perihelion until approximately four Earth days after it, Mercury's angular orbital speed exceeds its angular rotational velocity.

These points, which are the ones on the equator where the apparent retrograde motion of the Sun happens when it is crossing the horizon as described in the preceding paragraph, receive much less solar heat than the first ones described above.

To reduce the chances that a faster-moving (and thus closer) object be mistaken for the new planet, Tombaugh imaged each region near its opposition point, 180 degrees from the Sun, where the apparent retrograde motion for objects beyond Earth's orbit is at its strongest.

In addition, Copernicus's theory provided a strikingly simple explanation for the apparent retrograde motions of the planets-namely as parallactic displacements resulting from the Earth's motion around the Sun-an important consideration in Johannes Kepler's conviction that the theory was substantially correct.