A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

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

APoD today



 
 
Thread Tools Display Modes
  #1  
Old November 8th 18, 09:22 PM posted to sci.astro.amateur
Gerald Kelleher
external usenet poster
 
Posts: 1,372
Default APoD today

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

At least people are learning how to describe and differentiate the illusory loops of the slower moving planets where the Earth overtakes them and thereby a central Sun is inferred. Copernicus switched the 365 day motion of the Sun between Mars and Venus with the 365 day motion of the Earth.

I assume that the direct/retrogrades of the faster moving planets require a certain courage but the closed loops ,phases and numerous other components make it fairly easy with familiarity -

https://www.popastro.com/images/plan...ary%202012.jpg

The final piece was constructed in this newsgroup where the transition of the stars from left to right of the Sun sets up the Sun as a central reference for the motions of Venus and Mercury so the minimal effect of the Earth's orbital motion is to delay the points which Venus and Mercury reach before turning in front of the Sun or behind the Sun.

The partitioning of direct/retrogrades using faster/slower motions or wider/smaller orbital circumferences will eventually make it into circulation so at last I can take a rest.

Ads
  #2  
Old November 10th 18, 11:13 PM posted to sci.astro.amateur
Gerald Kelleher
external usenet poster
 
Posts: 1,372
Default APoD today

I love this poem -

The Cloths of Heaven

Had I the heaven's embroidered cloths,
Enwrought with golden and silver light,
The blue and the dim and the dark cloths
Of night and light and the half-light;
I would spread the cloths under your feet:
But I, being poor, have only my dreams;
I have spread my dreams under your feet;
Tread softly because you tread on my dreams.
W. B. Yeats

I love what our ancestors did, even when it was half light, and the need to handle their observations with care least they vanish under the gaze of crude minds much like the great poetical language of inspiration.

The motion of the direct/retrogrades of the faster moving planets join those of the slower as being equally of joy and satisfaction so we can look both out and in as we do in all aspects of life.







 




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
Today's APOD _ Amateur Astronomy 0 September 12th 07 01:19 PM
Stunning APOD today No Name Misc 2 April 16th 07 12:58 AM
APOD today Jim UK Astronomy 9 December 7th 04 09:46 PM
Today's APOD Rick Misc 2 July 23rd 03 01:30 PM
Today's APOD Rick Misc 2 June 30th 03 09:08 PM


All times are GMT +1. The time now is 04:52 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2004-2018 SpaceBanter.com.
The comments are property of their posters.