What are some of the challenges in accurately predicting the timing and duration of retrograde motion?

Sep 28, 2022 ... Retrograde motion is the motion of a celestial body that is opposite to its apparent orbit. It is derived from the Latin word retro, meaning backward. Jul 17, 2022 ... When Mercury and Venus are on the same side of the Sun as the Earth, though, they're moving westward relative to the Sun's ecliptic motion. Mar 19, 2009 ... This apparent backward motion is called retrograde motion. For this lab, we will use data already collected by an observer. Table 1 gives ... When an object in the sky appears to move backwards with respect to the common motion of the system, it is said to be in retrograde motion. Jan 22, 2020 ... Once the Earth reaches its closest point with another planet -- called opposition -- the other planet goes into what's called "retrograde." Prograde satellites of Uranus orbit in the direction Uranus rotates, which is retrograde to the Sun. Nearly all regular satellites are tidally locked and thus ... Apr 10, 2025 ... Retrograde motion of planets: to sum up. Retrograde motion is an apparent reversal of the planetary movement. From the Earth, it appears that ... Jul 12, 2005 ... Abstract page for arXiv paper astro-ph/0507269: Sun's retrograde motion and violation of even-odd cycle rule in sunspot activity. Apr 21, 2025 ... The meaning of RETROGRADE is having or being motion in a direction contrary to that of the general motion of similar bodies and especially ... It reaches its closest point to it on December 7, after which it enters retrograde motion, inching westward each evening until February 23, 2025. Mars then ...