A Space & astronomy forum. SpaceBanter.com

Go Back   Home » SpaceBanter.com forum » Astronomy and Astrophysics » Amateur Astronomy
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

Illusory loops vs actual loops.



 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old May 15th 18, 07:18 PM posted to sci.astro.amateur
Gerald Kelleher
external usenet poster
 
Posts: 1,551
Default Illusory loops vs actual loops.

The geocentric astronomers since the time of the Greeks observed that while the Sun appeared to travel through the background stars directly, all planets would occasionally process a loop against the background stars -

https://apod.nasa.gov/apod/ap100613.html

Copernicus determined the direct/retrogrades were an illusion caused by the faster Earth overtaking the slower moving planets

https://apod.nasa.gov/apod/ap011220.html

The faster moving Venus and Mercury and their direct/retrograde motions are entirely different as they process a real and actual loop around the parent Sun hence their loops are not illusory -

http://www.insideastronomy.com/index...-venus-phases/

It would be helpful for those who show up in classrooms or at those star parties to enjoy how we see the faster and slower moving planets from a moving Earth and distinguish what are illusory looping motions from what are the normal circuits of the planets around our parent star.
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
The five loops of Venus? W. eWatson[_2_] Amateur Astronomy 5 May 30th 12 08:34 PM
Other audio loops Jim Space Shuttle 1 December 18th 06 05:14 PM
Heating Coronal Loops Sam Wormley Amateur Astronomy 0 September 2nd 05 05:17 PM
Air to ground loops David Findlay Space Shuttle 0 July 29th 05 12:37 AM
Measuring "loops" in the Sun (Forwarded) Andrew Yee Astronomy Misc 0 November 14th 03 09:21 PM


All times are GMT +1. The time now is 11:29 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 SpaceBanter.com.
The comments are property of their posters.