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Copernicus' revolution and Galileo's vision, in pictures


EarthSky - Feb 19, 2018
The retrograde motion of planets such as Mars is merely an illusion, caused by the Earth “overtaking” Mars as they both orbit the sun. Ptolemaic baggage. The original Copernican model has similarities to Ptolemaic models, including circular motions and ...
 

New Moon, Partial Solar Eclipse Astrology Horoscope For The Week Of February 11


YourTango - Feb 11, 2018
Your weekly horoscope is in for all zodiac signs! Again no planets are in retrograde motion, at least not until March when Mercury goes retrograde again. The BIG news of the week is the New Moon Partial Solar Eclipse on the 15th. No, you're not seeing ...
 

The Liturgy of the Stars


Patheos (blog) - Feb 4, 2018
I'd puzzle over various models of the solar system, trying to understand counterintuitive phenomena like the retrograde motion of the planets in the night sky and the precession of the equinoxes. Now it was just a matter of the clock ticking down until ...
 

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Retrograde Motion videos

Retrograde Motion of Planets Explained


Why do planets occasionally move backward in the night sky? This video explains the phenomena known as retrograde motion. (Spoiler Alert): The apparent backward or 'retrograde' motion of the...
 

Retrograde Motion


This video surveys observations, historical theories, use of a mechanical demonstration, and compares the apparent motion for all superior planets of the motion.
 

Retrograde Motion and the Opposition of Mars


Superior planets (planets that are further from the Sun than Earth) can undergo retrograde motion when they are near opposition (the point in the sky that is opposite the Sun). Mars in particular...
 

Retrograde Motion


The planets normally move from west to east against the background of the stars, but every so often they backtrack for a while before resuming their eastward motion. This is called Retrograde...
 

Models of retrograde motion Geocentric and Heliocentric