Talk:Astrolabe/Archive 1

Archive 1

Astrolabe

I wanted to confirm that astrolabes were once used to locate Makkah (Mecca) and I had to do a separate search to accomplish this. I think it might be helpful to add a link from the Astrolabe page to the Makkah page. Perhaps more precisely, it would link to the Qibla article, which does have a link to the Astrolabe article. I also noticed that there seems to be a discrepency in the spelling of qibah. ~~Donna, 15 June 2005

You are very welcome to include this information in the article itself. Sounds very interesting, sort of remiding of the way that the Chinese used compass for religious purpose as well. Thank you ! Rama 08:21, 16 Jun 2005 (UTC)

Does the astrolabe help locate a precise position or just the latitude of the observer? It's my understanding that it does not give longitude of the observer, and I believe this should be stated in the article, and a reference to the longitude article included. Also, perhaps a brief discussion of the fact that two coordinates are needed to locate one's position on the surface of the earth, and that knowing one's latitude alone is not sufficient to know one's location. Thank you! Dmp717200 (talk) 16:21, 21 October 2009 (UTC)dmp717200

I have a few questions that I am curious about. 1.) Why was there not any mention of the Arabic myth about the creation of the astrolabe? 2.) Why is there little information about the Ancient Times of the astrolabe? Is it because the information can contradict itself or is there no reliable source fo the given information? Jmk5mc (talk) 17:14, 16 February 2018 (UTC)

Invention of metal astrolabe

I'm not convinced metal astrolabes were unknown before the 15th century. I was struck in the museum of history of science in Oxford by a beautiful example from around 950, somewhere in the Islamic world. However, I don't have the details to hand... if I can find them, I'll make the change. UncleKensson 21:53, 9 October 2005 (UTC) UncleKensson

Yes, the SOAS website has the oldest known dated brass astrolabe, some 500 years before Zacuto's. I'll change the text accordingly. UncleKensson 22:29, 9 October 2005 (UTC)UncleKensson

The link to SOAS's astrolabe is now broken. A quick search did not reveal a replacement link. --Lboges (talk) 20:17, 29 August 2012 (UTC)

I found an astrolabe from their site, but its picture caption says: "Astrolabe, by Muhammad Muqim al-Yazdi, Persian, 1647/8--"

Is this different, or the same? At least this is not that old as claimed by user UncleKensson. 85.76.49.68 (talk) 02:49, 16 July 2020 (UTC)

I found this page very interesting but hard to understand, you should make it clearer I still don't understand how an astrolabe works! ~ Summer Eldemire Jamaica

Kilroy

I was here! I'm going to fix these faulty references, unless someone else is faster. Said: Rursus 05:34, 23 April 2007 (UTC)

Did some, more needed – the loose unnumbered references in References should be associated with a certain text position, when possible, and then moved there, to become surrounded by <ref>...blarefbla...</ref>. Said: Rursus 05:42, 23 April 2007 (UTC)

The name

What is the origin of the name "astrolabe"? Is it in anyway related to "astro", stars, or is this just a coincidence? Nyh 10:53, 16 June 2007 (UTC)

American Heritage Dictionary says: Middle English astrelabie, from Old French astrelabe, from Medieval Latin astrolabium, from Greek astrolabon, planisphere : astro-, astro- + lambanein, lab-, to take. — Sam 13:05, 16 June 2007 (UTC)

OBS:coincidence may be correct but may not be the reason for establishing the origin of the instrument only with reference to the name. There are many monemnet preserved in present-day Iran and Indean Which begged only on function, to study stars.

In addition, the Persian language IndoEuropean ice, which means many of the words may be found in most european languages

Astrolabe vs sextant.

I question the accuracy of the second sentence of this article. The astrolabe was certainly an instrument that was well known and fairly well used in many parts of the old world and the orient (in the original sense), but it has never seemed to me to be a legitimate navigational instrument at sea. The Mariner's Astrolabe was developed in the late 15th c., but that is not the same as an astrolabe. It is a round, open-framed brass instrument with an alidade but lacking the planisphere and other components. The mariner's astrolabe was little used, though - only a few dozen are extant in collections today (G.L'E. Turner Antique Scientific Instruments. also see last paragraph here). The main instrument of navigation appears to be (from 1595) the John Davis (English explorer)'s Davis Quadrant, aka Backstaff - it was more accurate than the mariner's astrolabe and easier to use, especially for observations of the sun. The octant and later sextant replaced the Davis quadrant as far as I am aware.

The compass has an old history, dating in Europe to at least the 13th century. This time frame make the first statement a bit awkward.

It seems to me that a separate page for the mariner's astrolabe is required to eliminate some of the confusion.

Michael Daly 17:44, 21 August 2007 (UTC)

I've added an article on the mariner's astrolabe. I've changed this document to reflect the differences in the two instruments. Michael Daly 02:27, 27 August 2007 (UTC)

20100609

As you know the oldest Astrolabe funded from the area once called the Persian Empire. With Arabs take over the Persian language had to suffer through a forced change. E.g. many Al-have been added in front of many names. Many words change shape because there is not enough letters in the Arabic language. In Arabic there is no letter P, every single word they come by change it either to F or B, In Arabic is not possible to say two consecutive consonants. Star pronounced therefore Estar or Astar and loop (loop= Circle, Circulate, means movement of stars) pronounced lobe.

Arzachel

I noticed that there was no mention of Arzachel, who perfected the astrolabe during the 11th century. There are two links verifying it on his page, and I also read about this from another source. Would it be alright to add a sentence or two about him on this page, in the appropriate setting (Medieval section)?

So, how is it possible that Greeks named an instrument that has been invented in Persian? Could it not be possible that Greeks who have been in contact with Persian have had to borrow the word? We know it's very common to borrow word, especially Loan from ruler’s language.

If I can prove that, I can prove even that the culture in a row with many other things that today are defined as Arabic is actually and originally is Persian. For instants KEMIA, this means rare in Indo-European language. But put a AL in front of it make it the known name AL-chime and its Arabic now. Why am I doing this? I think the right should be right. —Preceding unsigned comment added by 188.121.68.1 (talk) 08:52, 27 January 2010 (UTC)

Mobile Astrolabe and Horologium

I have added a link to Mobile Astrolabe and Horologium. This link enables mobile and instant access to the astrolabe or horologium model of the universe from any point of earth with update each minute. Also the postions of planets and stars are given. It also explains on the background and ingenuity of these monumental models of the universe. chrsyl — Preceding unsigned comment added by Chrsyl (talk • contribs) 15:58, 26 March 2011 (UTC)

Computer generated astrolabe, ecliptic longitudes?

The computer generated astrolabe is otherwise very fine, and I am glad someone bothered to make it, but I think the markings of the zodiac (near the ecliptic) are a little bit ... well ... wrong.

Signs of zodiac are (at least in astrology) defined using _ecliptic_ longitudes, not rectascensions of the equator. Therefore the center of the signs of zodiac is the pole of the _ecliptic_, not the pole of the equator.

There are signs of zodiac on the computer generated astrolabe. And there are also coordinates. Fine. There is something wrong however. The lines separating the signs and the lines showing the coordinates obviously point to the celestial pole, that is the pole of the equator, the center of astrolabe. Methinks they should not.

Of course you can connect the pole of the equator to the ecliptic and separate arcs of 30 degrees ... but I don't thing they are either _ecliptic_ longitudes or the true borders of the signs of zodiac (of astrology).

Because of stereographic projection the pole of ecliptic is not at the center of the projected ecliptic, but it surely is away from the pole of the equator which is at the center.

Have I totally misunderstood what signs of zodiac are? Is there a different astronomical definition for them? Maybe so, but I find this construction "rectascension of the ecliptic plane" rather unusual on an astrolabe.

My source? Hmmm ... common sense ... basics of spherical astronomy found on just about any work worth reading

Sincerely Vesa.V.Petäys — Preceding unsigned comment added by 212.146.45.78 (talk) 10:14, 24 January 2012 (UTC)

Yes I think you are right, there is a section in Van Cleempoel, Astrolabes at Greenwich (OUP 2005) which describes in detail how this error of laying out the ecliptic arises. Aparrently this is also an error found on some genuine antique astrolabes as well. Simonchadwick1023 (talk) 21:09, 8 November 2013 (UTC)

Astrolobes?

I seem to remember having once read about an astrolobe, and a search for it redirects here. Is that just an alternate spelling, and if so, shouldn't the article mention that? — Preceding unsigned comment added by 97.124.76.97 (talk) 03:46, 14 August 2012 (UTC)

• I think so! Aarghdvaark (talk) 00:34, 4 March 2016 (UTC)

re woking

I can find no citation any where for wooden astrolabes. this source is a really good one Lewis, M. J. T. (2001-04-23). Surveying Instruments of Greece and Rome. Cambridge University Press. ISBN 9780521792974. Retrieved 30 August 2012. and I plan to use it to improve the article. If some one else gets here first be bold J8079s (talk) 20:09, 30 August 2012 (UTC)

File:Iranian Astrolabe 14.jpg to appear as POTD

Hello! This is a note to let the editors of this article know that File:Iranian Astrolabe 14.jpg will be appearing as picture of the day on November 25, 2014. You can view and edit the POTD blurb at Template:POTD/2014-11-25. If this article needs any attention or maintenance, it would be preferable if that could be done before its appearance on the Main Page. Thanks! — Crisco 1492 (talk) 00:58, 4 November 2014 (UTC)

Picture of the day

An Iranian astrolabe, handmade from brass by Jacopo Koushan in 2013. Astrolabes are elaborate inclinometers used by astronomers, navigators, and astrologers from classical antiquity, through the Islamic Golden Age and European Middle Ages, until the Renaissance. These could be used for a variety of purposes, including predicting the positions of the Sun, Moon, planets, and stars; determining local time given local latitude; surveying; triangulation; calculating the qibla; and finding the times for salat.Photograph: Masoud Safarniya

Inclinometer?

I am surprized to see the astrolabe described as an "elaborate inclinometer". This is a description which I have never seen used in the extensive literature on astrolabes. Are all astronomical instruments (cross staffs, octants, sextants, quadrants, etc.) which measure the altitude of a celestial body to be classified as a type of inclinometer? AstroLynx (talk) 15:08, 3 January 2015 (UTC)

Image addition proposal

Animation showing how celestial and geographic coordinates are mapped on an astrolabe's tympan through a stereographic projection. Hypothetical tympan (40 degrees North Latitude) of a 16th century Europenan planispheric astrolabe.

Hello everybody. I find the astrolabe to be an amazing instrument, but also rather complex to understand for somebody that, like me, hasn't a good enough background in astronomy. I thought that a representation of what's behind the drawings on the tympan could make the 'Construction' section a little clearer. The tympan in the animation refers to a 40 degrees North Latitude and the elements drawn on it are the ones that were usually present on a 16th century European planispheric astrolabe. What do you think? I'll be happy to improve the gif if you have any suggestion. Thank you. Italianmitch (talk) 22:46, 24 November 2015 (UTC)

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Planisphere vs. Astrolabe

Both this article and Planisphere state that the astrolabe is the predecessor of the astrolabe. A brief comparison shows that an astrolabe can serve as a planisphere, but not the other way around - surely the articles should describe the planisphere as a modern simplification of an astrolabe? Stub Mandrel (talk) 09:19, 24 October 2016 (UTC)

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The second image is missing accompanying text. Dutchy45 (talk) 22:40, 17 January 2018 (UTC)

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oldest surviving?

I found a BBC article "Astrolabe: Shipwreck find 'earliest navigation tool'", which claims oldest surviving is from Vasco da Gama's shipwreck, manufactured around 1495-1500.
The article has a picture of an astrolabe from 1282, and a globe from 1144. The 1282 astrolabe is about 200 years older than the 'earliest navigation tool' claimed by BBC (or should I say BBS?). Is the globe also a navigation tool? Seems too big, but that would be 350 years older. 85.76.49.68 (talk) 02:54, 16 July 2020 (UTC)

Schematic Image Addition

In the construction section, I think it would be helpful for readers if a schematic of some sort was included. Any picture that breaks down the individual pieces of an astrolabe and labels them appropriately should do. Does anyone else agree or have a photo in mind? COeditor1 (talk) 16:48, 25 September 2020 (UTC)