Talk:Al-Zarqali

This article is within the scope of WikiProject Biography, a collaborative effort to create, develop and organize Wikipedia's articles about people. All interested editors are invited to join the project and contribute to the discussion. For instructions on how to use this banner, please refer to the documentation.BiographyWikipedia:WikiProject BiographyTemplate:WikiProject Biographybiography

Spain Mid‑importance

	Spain portal This article is within the scope of WikiProject Spain, a collaborative effort to improve the coverage of Spain on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.SpainWikipedia:WikiProject SpainTemplate:WikiProject SpainSpain
Mid	This article has been rated as Mid-importance on the project's importance scale.

Astrology

	This article is within the scope of WikiProject Astrology, a collaborative effort to improve the coverage of Astrology on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.AstrologyWikipedia:WikiProject AstrologyTemplate:WikiProject Astrologyastrology
???	This article has not yet received a rating on the project's importance scale.

Middle Ages Low‑importance

	Middle Ages portal This article is within the scope of WikiProject Middle Ages, a collaborative effort to improve the coverage of the Middle Ages on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.Middle AgesWikipedia:WikiProject Middle AgesTemplate:WikiProject Middle AgesMiddle Ages
Low	This article has been rated as Low-importance on the project's importance scale.

Astronomy Mid‑importance

	Astronomy portal This article is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Wikipedia.AstronomyWikipedia:WikiProject AstronomyTemplate:WikiProject AstronomyAstronomy
Mid	This article has been rated as Mid-importance on the project's importance scale.

Untitled

==The footnote 1 is missing.==

Encyclopedia Britannica states "Al-Zarqali also anticipated Johannes Kepler by suggesting that the orbits of the planets are not circular but ovoid." Ovoid is egg-shaped. (http://www.britannica.com/eb/article-70382/Spain) "Relativity: an introduction to the special theory" author, Asghar Qadir does state that Al-Zarqali had a sun-centered model with the planets in elliptical orbits. TedHuntington 22:31, 30 May 2007 (UTC)[reply]

Thanks, I added the Notes section now. --SteveMcCluskey 20:50, 31 May 2007 (UTC)[reply]

''''Bold text'

Variety

There is a variety regarding the achievements and works completed by Abū Ishāq Ibrāhīm al-Zarqālī, they must be elaborated accordingly, his works cannot just be divided into "Theory" and "Astronomy". — Preceding unsigned comment added by Mughal Lohar (talk • contribs) 20:56, 8 October 2011 (UTC)[reply]

Ellipses?

I've checked the reference to the book by Ashgar Qadir and find he makes this, and a number of other, dubious and undocumented historical assertions in the introductory section to a book on physics. This claim, which contradicts the nature of Al-Zarqali's astronomical model based on eccentric circles and epicycles as used in the Tables of Toledo and as described in the discussion of his measurement in the solar apogee should either be fully documented or removed. --SteveMcCluskey 20:54, 31 May 2007 (UTC)[reply]

There is a similar claim that al-Biruni that advocated elliptical orbits which, when checked, indicates a very different connection with ellipses and celestial spheres. I don't know if that's what's going on regarding Arzachel but given the nature of medieval cosmological concerns, it seems very likely. See the discussion at Talk:Abū Rayhān al-Bīrūnī#Elliptical orbits?. --SteveMcCluskey 20:57, 5 June 2007 (UTC)[reply]

I've just come across a reference to a claim by Peurbach that the center of the epicycle of Mercury travels in an oval path. This refers to the complex motion of Mercury which Ptolemy had explained using a complicated crank mechanism. This source (E. J. Aiton, "Peurbach's Theoricae Novae Planetarum: A Translation with Commentary", Osiris, 2nd Series, Vol. 3. (1987), pp. 4-43, at p. 26) also notes (n. 71) that "it had been so described by al-Zarqali". Again, this would not be a claim for elliptical orbits of the planets since

The path is egg-shaped, not elliptical,
The path is that of the center of the epicycle, not of the planet,
It only applies to Mercury, not to all the planets.

--SteveMcCluskey 21:41, 5 June 2007 (UTC)[reply]

PS The source to which Aiton refers in the article cited above is Willy Hartner, "The mercury horoscope of marcantonio Michel of Venice: A study in the History of Renaissance astrology and astronomy," Vistas in Astronomy, 1 (1955): 84-138 ( doi:10.1016/0083-6656(55)90016-7 ). The following appears in the abstract of Hartner's paper:

The second part of the paper discussed the history and development of Ptolemy's theory of Mercury. In a degression the algebraic curve described by the centre of Mercury's epicycle is analysed. It is shown that this curve is practically interchangeable with the ellipse. The curve appears for the first time in a treatise by Azarquiel (eleventh century) which is preserved in a Spanish translation incorporated in the Libros Saber. European historians, with the exception of A. Wegener (1905), have failed to recognize the true significance of this curve, which is by no means an anticipation of Kepler's ellipse though it may have one of the stimuli that led to his experimenting with oval (elliptiform) curves.

In sum, al-Zarqali did not describe elliptical orbits for the planets. --SteveMcCluskey 22:04, 5 June 2007 (UTC)[reply]

Request for evidence

I have recently looked for sources supporting and criticizing a number of myths appearing in discussions concerning the History of astronomy. If you know of any sources related to these myths, please add them to the discussion at Talk:History of astronomy/Common misconceptions. --SteveMcCluskey 20:01, 9 June 2007 (UTC)[reply]

External links modified

Hello fellow Wikipedians,

I have just modified one external link on Abū Ishāq Ibrāhīm al-Zarqālī. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

Added archive https://web.archive.org/web/20120331211945/http://www.isesco.org.ma/english/publications/Architects/P24.php to http://www.isesco.org.ma/english/publications/Architects/P24.php

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}).

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 03:15, 3 October 2016 (UTC)[reply]

External links modified

Hello fellow Wikipedians,

I have just modified one external link on Abū Ishāq Ibrāhīm al-Zarqālī. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

Added archive https://web.archive.org/web/20110305133942/http://muslimheritage.com/topics/default.cfm?ArticleID=729 to http://www.muslimheritage.com/topics/default.cfm?articleID=729

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 17:18, 25 June 2017 (UTC)[reply]