Talk:Apparent retrograde motion
|WikiProject Astronomy||(Rated Start-class, High-importance)|
Please note. In Auguest 2009, this article was moved from Retrograde and direct motion. All of its talk, history and log pages went with it because it was decided that virtually all the article itself was about Apparent Retrograde Motion. Retrograde and direct motion now directs to Retrograde motion, not here. The first 15 sections below were created before the renaming took place and may discuss topics that are no longer present. --RoyGoldsmith (talk) 01:22, 19 August 2009 (UTC)
- 1 Retrogation
- 2 Orphan Mystical Paragraph
- 3 Circular reference
- 4 Error in image
- 5 Apparent Retrograde Motion
- 6 Retrograde motion.
- 7 Pluto
- 8 Definition of "north orbital pole" contradicts that given in the "Orbital pole" article
- 9 Astrological
- 10 2003
- 11 Some pure rubbish
- 12 Inferior retrograde
- 13 Picture of the Day
- 14 WASP-17b
- 15 Do we really need an astrology section?
- 16 We need separate discussion pages
- 17 There should be a section about how this affected ancient astronomers
- 18 Astrology
Im looking for an authoritative source that uses the term retrogradation. If there isn't such a source, I still like the idea of the word as it is defined here, but I'd like to know if this word is actually used atm. Lir 15:09 Nov 4, 2002 (UTC)
- (three and a half years later), i removed the term 'retrogradation' from the article; a google search suggests it's meaning have more to do with chemistry. 126.96.36.199 15:23, 11 March 2006 (UTC)
- Actually it simply means retrograde motion. Limiting it to apparent retrograde motions appears to have been unjustified. kwami 22:11, 11 March 2006 (UTC)
Orphan Mystical Paragraph
what is interesting here is to know that the religion of muslims (islam) talked about this motion through the prophet muhammed, by saying that sun someday will rise from west after three days of not rising and this will be a sign of groups of group of signs before the day of judgment.
Since this is way OT, having nothing to do with retrograde orbit (since this would have to affect rotation not orbit), and since prophecy doesn't lend itself to verification. Dominick 12:06, 30 Jun 2004 (UTC)
- Something similar had showed itself, as an 'External Link'
"Muslims knew about this thousands of years ago. To read more go to http://www.shiaconnect.com/forum/showthread.php?t=223 (iam not advertising)."
I have removed it on the grounds that the tone is distinctly un-wikipedia-ish, and also, as a forum, the content may be volatile. A link along the same lines but to a proper website, not a forum, can certainly be added if someone can find it. 188.8.131.52 23:34, 23 May 2006 (UTC)
--- True enough that Muslim texts do mention the Sun rising from the West. However, muslim texts also allude to the sun moving in it's own exclusive orbit. Is it farfetched to ponder the possibility of the Orbit of our solar system meshing our coming near to the orbit of another solar system? Would it not create the same effect of our sun or a sun rising from the west?
Dr. Maurice Bucaille in his brief yet informative booklet entitled "The Bible, the Qur’an and Science" edited by Dr. A. A. B. Philips writes:
Today, the laws governing the celestial systems are well known. Galaxies are balanced by the position of stars and planets in well-defined orbits, as well as the interplay of gravitational forces produced by their masses and the speed of their movements. But is this not what the Qur’an describes in terms which have only become comprehensible in modern times. In chapter al-Ambiyaa we find:
“(God is) the one who created the night, the day, the sun and the moon. Each one is traveling in an orbit with its own motion.” Qur’an,21:33
The Arabic word which expresses this movement is the verb yasbahoon which implies the idea of motion produced by a moving body, whether it is the movement of one’s legs running on the ground, or the action of swimming in water. In the case of a celestial body, one is forced to translate it, according to its original meaning, as ‘to travel with its own motion.’
In my book, The Bible, The Qur'an and Science, I have given the precise scientific data corresponding to the motion of celestial bodies. They are well known for the moon, but less widely known for the sun."... - Dr. Maurice Bucaille
- Abu Raihanah Chris Medlock ---
- Eeh, this page is for discussing the qualities of the article Retrograde and direct motion, not any "revelation" this or that, and regarding "precise scientific data corresponding to the motion of celestial bodies": modern science (available to christians, moslems, jews and atheists alike) provides painstakingly precise truly scientific data, since this article is about science, not religion, nor pseudoscience. ... said: Rursus (bork²) 15:25, 25 June 2009 (UTC)
Error in image
In the 2nd image ("Like that") with a retrograde motion, either the symbols A2 and A4 are swapped (if you start from left A1), or there are 2x A1 !
Well, I cannot edit swg graphics... Would you correct it?
- The image is correct, so no need to correct it! It should be that way. ... said: Rursus (bork²) 15:12, 25 June 2009 (UTC)
- Sorry, I misread you: A2 to A4 are in correct order. The error was that A5 was replaced by A1. Somebody silently corrected the error by producing a new image, not me. ... said: Rursus (bork²) 15:14, 25 June 2009 (UTC)
Apparent Retrograde Motion
The article says that planets beyond the Earth's orbit appear to switch direction. I think it's true to say that the planets inside the Earth's orbit would also exhibit this behaviour as they periodically overtake the Earth, but it is not seen because it always occurs during the day time.
- I think you're mostly correct, except it might actually be observable. ... said: Rursus (bork²) 15:10, 25 June 2009 (UTC)
- What you mean to say is that they take place too close to the sun to be visible because of the glare and because the planets (from our viewpoint) are in new phase (just like the new moon) and show only small amounts of reflectance. It happens over several week's time, day and night.SkoreKeep (talk) 21:35, 1 August 2014 (UTC)
- Planetoid is another name for asteroid. Pluto is not an asteroid/planetoid.--Systemizer (talk) 09:53, 30 June 2009 (UTC)
Definition of "north orbital pole" contradicts that given in the "Orbital pole" article
See the sentence "The north orbital pole ... is defined to be south."
The same sentence in the "Orbital Pole" article is "The north orbital pole ... is defined to be north."
I'll leave it to an expert to decide which is right.
I've just edited this bit to make it clear that the explanation given is not accepted by all astrologers. I've credited it to "a contributor" because I can't make out from the history who put it in. If whoever it is wants to sign it they're welcome.Wombat140 (talk) 21:02, 11 March 2009 (UTC)
- The "contributor" credit doesn't seem appropriate for wiki. It sounds like the editor is just guessing at what astrologers say without any research. 184.108.40.206 (talk) 22:47, 4 June 2009 (UTC)
- Fixed. Typically this kind of error can be smashed at sight, so be bold, kind of. ... said: Rursus (bork²) 06:42, 25 June 2009 (UTC)
Some pure rubbish
Section Retrograde motion in astrology contains some very low-quality logic:
- Only the inferior planets—Mercury and Venus—can become genuinely retrograde, since their retrogradeness is produced by their own motion.
The "since" subclause is false. All motions are relative, involving Earth's motion and the planet's motion, and no planet travels retrogradely as seen from a fixed point far above the north pole of sun. Hence the entire clause is false. ... said: Rursus (bork²) 15:39, 25 June 2009 (UTC)
And the source provided claims nothing of that kind. ... said: Rursus (bork²) 15:41, 25 June 2009 (UTC)
- No, comment? Then, I'm going to delete the unimportant text making that erroneous claim. ... said: Rursus (bork²) 06:57, 3 July 2009 (UTC)
Can we get some figures or animation involving the process of retrograde involving an inferior planet? As the article says, "Mercury in retrograde" is a very common astrological phrase, but there is not enough description differentiating how the retrograde motion would appear or its frequency. MMetro (talk) 09:36, 11 August 2009 (UTC)
- The problem is that Mercury and Venus display retrograde motion from Earth only at superior conjunction when the sun is between the Earth and the body. Not only is the sun blocking out the view, but the glare is far too high to see the motion in any case, as it obviously can only be viewed in the daytime. If it could be seen, it would appear just like it does for the outer planets; the body would pass the sun, appear to stop and then pass back behind the sun again, then stop on the other side and pass it a third time; as it is, it appears to wane as a morning star, spend an apparently inordinate amount of time out of view before re-emerging as an evening star. The frequency is once every synodic period of the planet; for Venus that's 584 days, for Mercury it's 116 days. SkoreKeep (talk) 15:38, 23 June 2014 (UTC)
Picture of the Day
WASP-17b is the first planet (really exoplanet) discovered that exhibits true retrograde motion, like Triton. The article about Retrograde and direct motion talks mainly (or exclusively, I'm not sure) about apparent retrograde motion. Now that a retrograde planet has been observed, this should be made clear, possibly with links to Triton and WASP-17b. I'd do it myself but I'm not an astronomer. --RoyGoldsmith (talk) 12:47, 14 August 2009 (UTC)
- I've split this into two separate articles for apparent and actual motion. Zbayz (talk) 18:05, 15 August 2009 (UTC)
Do we really need an astrology section?
The astrology section is nothing more than some evidence-free claims made up out of whole cloth. If you check the citations, they say things like "When a person is born with Mercury Retrograde, it indicates that in past lives there was a discrepancy between the words the native was speaking, and what they truly thought on their own." Why does this information deserve to be in an encyclopedia? Gary (talk) 17:33, 15 August 2009 (UTC)
- Yes, we do. I added the section back, and modified it. It was frankly surprising to see the topic not covered. While you may consider astrology inherently subjective, it is a subject with a vast literature and easily meets all our criteria for inclusion, and our standard is reference-ability, not truth. There is, moreover, a broad consensus at least among Western astrologers about the tradition and what things mean within it. Treat it as a folklore subject, if you like. Omission of the subject might be considered an instance of positivist bias, and there's a lot of that going around. The subject is indeed large enough to support a potential article on retrograde motion in astrology, but should be at least mentioned with an introductory mention here. I added back part of the old section, removed particular interpretations, and added a reference. - Smerdis of Tlön - killing the human spirit since 2003! 15:32, 12 August 2011 (UTC)
We need separate discussion pages
The discussion links at the tops of the articles Apparent retrograde and direct motion and Retrograde and direct motion both direct a user to the same talk page. This is confusing. Both articles should have their own talk pages, because not everything on the talk page is applicable to both articles. For example, when I questioned the need for an astrology section, I based that question according to Apparent retrograde and direct motion, which has an astrology section, not on Retrograde and direct motion, which lacks an astrology section (as it should). Gary (talk) 18:32, 16 August 2009 (UTC)
- OK. I've started up a talk page for Retrograde and direct motion by cut-and-pasting this section and the WASP-17b section above to the R&DM talk page. Any further discussion on this page should pertain solely to apparent motion. --RoyGoldsmith (talk) 19:41, 16 August 2009 (UTC)
There should be a section about how this affected ancient astronomers
This is a decent article, but I feel like there needs to be a section covering the effect this had on astronomers such as Aristotle, Eudoxus, etc. This apparent retrograde motion is what caused ancient astronomers to begin using concepts such as equants, eccentrics, and epicycles. It also led to Eudoxus' nested sphere model of planetary motion. These subjects are extremely important when looking at the history of science and since they were completely caused by apparent retrograde motion, there should be a section discussing these effects. Nro87 (talk) 20:01, 24 May 2013 (UTC)
This article is about Apparent retrograde motion. We don't mention fringe beliefs in mainstream articles without good reason, otherwise that would give them undue weight (WP:ONEWAY). Issues with Astrology should not be discussed in this article on Apparent retrograde motion since there are no independent reliable sources which "connect the topics in a serious and prominent way". IRWolfie- (talk) 23:45, 28 June 2013 (UTC)
- Agreed. The change (Johnuniq (talk) 03:23, 29 June 2013 (UTC)
) with talk about "Psychological astrology ... point toward an interior reality" is not appropriate for a scientific topic.
- I don't know how much detail is appropriate for this article, but there should definitely be a place for information about the notion of retrograde in astrology; while not fact-based, it is an important thing culturally, and does deserve a place in the encyclopedia. I'll try to find some sources and write up a (probably short, but) improved treatment of it within the next couple days, but I don't think the section should be cut out entirely. Abeg92contribs 07:12, 7 July 2013 (UTC)