Talk:Ulleungdo

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Seeing Dokdo?

My maths are not at their best anymore, but this sentence (16:10, 19 August 2005 (UTC)):

coastal cliff from which the Liancourt Rocks (known in Korea as Dokdo) can be discerned in the distance

under the Tourism section puzzles me. Engaging good old Pythagoras (a²+b²=c², with a=Earth radius, c=Earth radius+height, b=distance seen) I calculated that I can see as far as 112km from the highest peak of Ulleung-do (984m), which includes Dokdo (apparently some 90km). Now, given that Dokdo itself reaches 179m, I tried the inverse calculation, which turns out that this cliff mentioned in the article needs to be 815m above sea level... This is not my understanding of a cliff... (also, of course, I only used the average Earth radius of 6371km which may be way off locally).

I really wonder whether anyone could enlighten me on this. If my maths are correct, I suggest this sentence be rewritten. Kokiri 16:10, 19 August 2005 (UTC)[reply]

Hi Kokiri, here's my calculation. Let r=radius of the Earth (use your 6371 km), a=height above sea level of some spot on Ulleung-do, b=height above sea level of highest spot on Dokdo (179 m). If you stand at the top of Dokdo, the horizon on open water is a distance h away; and the horizon on open wwww.novell.com/linux/ater from your vantage point on Ulleung-do is a distance g away. By Pythagoras, g²+r²=(r+a)², and h²+r²=(r+b)². In order for your point on Ulleung-do to see the top of Dokdo, these two horizons must overlap. If d=distance from Dokdo to Ulleung-do, the requirement is g+h>d. Plugging this in and solving for the height (and dropping small terms), you should have a line of sight to the tip of Dokdo from any point on Ulleung-do that's at height a if sqrt(a) > d / sqrt(2r) - sqrt(b). In this case, I get 140 m. That's still pretty tall, but not unreasonable. The Dokdo Observatory is on top of Manghyang-bong, 317 m according to the map here (page 33 of the pdf): [1]. From there you should have a line of sight to the part of Dokdo that's 55 m above sea level or higher. --Reuben 20:42, 19 August 2005 (UTC)[reply]

Cheers, very helpful. Kokiri 21:22, 19 August 2005 (UTC)[reply]

No problem! It would probably be good to add some details there as it could be a controversial point because of Liancourt Rocks / Dokdo / Takeshima. --Reuben 21:57, 19 August 2005 (UTC)[reply]

Population

The article should say how many people live on the island. AnonMoos 17:39, 9 October 2005 (UTC)[reply]

Dagelet as Ulleungdo?

There is contradicting information even within Wikipedia. First of all, if you look up "Argonaut" on Wikipedia, you find a link to Ulleungdo.

Furthermore, there's this map: http://upload.wikimedia.org/wikipedia/commons/d/d5/Letts-Popular-Atlas-1883-Russia-in-Asia-Chinese-Empire-etc.jpg If you look at that map, Argonaut and Dagelet are marked as separate islands off the eastern coast of Korea. Looking at their locations on the map, Argonaut should be Ulleungdo and Dagelet corresponds to the location of Dokdo.

If someone could conjure up a proper source for this it would be helpful. Unbal3 (talk) 00:52, 10 April 2012 (UTC)[reply]

Consistency

Article (and article title if necessary) should be consistent on whether it should be written "Ulleungdo" or "Ulleung-do". As it stands, the article happily alternates with a slight preference for the non-hyphenated version. --131Platypi (talk) 12:42, 5 September 2019 (UTC)[reply]