Talk:Hemisphere
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The half of the Earth to the south of the Equator is called the southern hemisphere, while the half to the north of the Equator is called the northern hemisphere.
Do we have population figures (estimates of course) for these two hemispheres? 125.239.241.123 (talk) 04:29, 14 February 2012 (UTC)
By convention, the Americas are called the western hemisphere, while Europe, Asia, Africa and Australia are collectively termed the eastern hemisphere. The western hemisphere is also sometimes called the new world, while the eastern is called the old world.
I have no problem with the trifurcating definition list that replaced this, but I believe that this information still belongs on the page and should not have been taken off. User:jaknouse
This change was of practical nature only. Imagine someone following a link
hemisphere from the brain article and arriving at the article which content
tells only about geography aspect of the term.
--User:Kpjas
I thought the western hemisphere is everything from the prime meridian westward to 180, while the eastern hemisphere is the rest. Thus Ireland is in the western hemisphere. There's also the water hemisphere and the land hemisphere; where's the boundary? -phma
I think something on the page is better then nothing at all.
--Trisped
The mobile edition of this page allows no edits and appears to have been vandalized. The second bulletin list should begin with "Any half of the Earth" but has been edited to continue with "or gay people". I've never bothered to register in my years of Wikipedia use so I'm not sure what the proper process for fixing the mobile site is.
Definition & surface area
editThe definition of hemisphere as "half a sphere" perhaps needs pedantic modification."Half a sphere as bisected through any of its great circles". In which sense it may be obvious but not known to all, that the curved surface is exactly double that of the flat surface. Which ratio of course varies for balls of other than three dimensions, such as the semicircle, or the glome. This ratio is 1/2 Sn/Vn -1, where Sn is the surface of an n-ball of unit radius and Vn-1 the volume or content of a ball of the same radius in the next lower dimension. In the case of a semicircle, the ratio is 1.57+; for a hemisphere 2.00; in 4 dimensions 2.35+; and 2.66+ in 5,reaching 3 in 7 dimensions (3.2 exactly)and apparently increasing by small increments forever.125.239.241.123 (talk) 19:47, 14 February 2012 (UTC)