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* very few land places have a land antipode #maps (Image source: https://en.wikipedia.org/wiki/Antipodes)
It's incredible that this thing is still doing the rounds after 4.5 months. Also, a high I'm pretty sure will never reach again.
@mdione Aotearoa has Spain. So we can both hold bread and make the earth into a sandwich
@mdione but at least some of the most populated regions in east Asia do, so that does increase the likelihood of antipodal earthlings
@funkylab except that Argentina and Chile are quite sparse. .ar is 16p/km², .cl is 26 and .cn is 149.
@mdione In case you did not learn that today, too: By total coincidence, the main island of Taiwan (which is historically known as Formosa) is the (partial) antipode of the Formosa province in Argentina.
#Bard says:
The #antipode of #Sacramento, California is Port-aux-Français, #Kerguelen, French Southern Territories ... If you dig a hole straight through the Earth from Sacramento, you would come out in the Indian Ocean, southeast of #Madagascar.
-/—
I think I’d do the #math and sail instead.
@mdione what's most annoying to me in this is that Italy and New Zealand are so close in shape that is they matched antipodalically it'd be amazing, but there's that small offset …
@oblomov howly sheet!
@mdione
With around 70% of the Earth covered in water, it is statistically likely that any bit of land you find will happen to have water at its antipodes.
The fact that most land happens to be in the northern hemisphere only skews things more.
@mdione This map is very instructive
@mdione I only noticed now that the #Philippines is the largest country to have none of its territory have any oceanic antipodes.
@seav Took me a while to parse that (double negation). So, "largest country with a 100% land that has land antipodes", right?
@mdione wow so “digging a hole all the way to China” was only true for … Argentinians? 
@christmastree ... and Chileans, don't forget our brothers from the other side of the Andes :)
@mdione Brute force GIS question: which national capitals have the closest antipode capitals? Buenos Aires and Beijing? Auckland and Madrid?
@bkeegan aarg, now you're going to make me calculate it! BsAs or Santiago?
@bkeegan coll, someone did it for us:
https://www.antipodesmap.com/#antipodes-cities
6 candidate pairs:
Taipei (Taiwan) — Asuncion (Paraguay)
Bangkok (Thailand) and Phnom Penh (Cambodia) — Lima (Peru)
Montevideo (Uruguay) — Seoul (South Korea)
Bogota (Colombia) — Jakarta (Indonesia)
-- Suva (Fiji) — Timbuktu (Mali) -- Timbuktu is not the capital, just a well known name, for some reason...
Singapore — Quito (Ecuador)
Any #gis expert that can calculate this quicker than me?
@michael_w_busch how was your French? :)
@michael_w_busch I meant about Madagascar, French is one of the two official languages (and the other one is not English :)
@mdione
Woah that's so cool! I really expected there to be a lot more
@mdione wait a minute, so the continents are flipped?!
@yellowlime doubly flipped, vertically and horizontally.
The math is simple: in terms of latitude, if you're at Y degrees South, your antipode is Y degrees North and viceversa.
Longitude is a little bit more complex, but not that much. if you're X degrees East of the Greenwich Meridian, your antipode is the same amount of degrees East of the Antimeridian (180˚). If, like currently, we consider East degrees as positive and West degrees as negatives, then your antipodes is at (180 + Y) mod 180.
@yellowlime the mod 180 is to cover positives Ys that give an amount bigger that 180.
To summarize, if you live at (X, Y), your antipodes is at:
X' = -X
Y' = (180 + Y) mod 180
The first one gives you the flip around the Equator. The second one the vertical flip. The map above is not quite using the Greenwich Meridian but 20° West, but the selection of the GWM is completely arbitrary, so is this one.