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  2. Retrograde and prograde motion - Wikipedia

    en.wikipedia.org/wiki/Retrograde_and_prograde_motion

    This is the first known example of a counterrotating accretion disk. If this system forms planets, the inner planets will likely orbit in the opposite direction to the outer planets. [33] WASP-17b was the first exoplanet that was discovered to be orbiting its star opposite to the direction the star is rotating. [34]

  3. Apparent retrograde motion - Wikipedia

    en.wikipedia.org/wiki/Apparent_retrograde_motion

    The more distant planets retrograde more frequently, as they do not move as much in their orbits while Earth completes an orbit itself. The retrograde motion of a hypothetical extremely distant (and nearly non-moving) planet would take place during a half-year, with the planet's apparent yearly motion being reduced to a parallax ellipse.

  4. Kepler's laws of planetary motion - Wikipedia

    en.wikipedia.org/wiki/Kepler's_laws_of_planetary...

    Despite being correct in saying that the planets revolved around the Sun, Copernicus was incorrect in defining their orbits. Introducing physical explanations for movement in space beyond just geometry, Kepler correctly defined the orbit of planets as follows: [1] [2] [5]: 53–54 The planetary orbit is not a circle with epicycles, but an ellipse.

  5. There are no planets in retrograde until April. Why ... - AOL

    www.aol.com/news/no-planets-retrograde-until...

    All planets are direct at the start of 2024, from late January to April. Here are the dates of the retrograde-free period and what to know. ... Retrogrades occur when a planet appears to move ...

  6. 5 planets are about to be retrograde at the same time. What ...

    www.aol.com/news/5-planets-retrograde-same-time...

    A total of five planets are going retrograde between May and September: Mercury, Saturn, Uranus, Neptune and Pluto. "Retrograde" is a term used to describe when a planet's orbit appears to slow.

  7. Earth's rotation - Wikipedia

    en.wikipedia.org/wiki/Earth's_rotation

    Copernicus pointed out that if the movement of the Earth is violent, then the stars' movement must be much more so. He acknowledged the contribution of the Pythagoreans and pointed to examples of relative motion. For Copernicus, this was the first step in establishing the simpler pattern of planets circling a central Sun. [19]

  8. Copernican Revolution - Wikipedia

    en.wikipedia.org/wiki/Copernican_Revolution

    1. The Law of Ellipses: All planets move in elliptical orbits, with the Sun at one focus. 2. The Law of Equal Areas in Equal Time: A line that connects a planet to the Sun sweeps out equal areas in equal times. 3.

  9. Astrological transit - Wikipedia

    en.wikipedia.org/wiki/Astrological_transit

    The retrograde motion of a planet is its apparent backward motion through the sky caused by the Earth travelling past a slower-moving outer planet, or when the Earth is itself passed by a faster-moving inner planet. [8] The outer planets are retrograde for over 40% of the time.