等距環 Equidistant small circles

茲製等距環以知各地離此之距離。 I managed to make maps to help me get an idea of how far places are from me. 讀者應能應用至其所居之地方。 I'm sure the reader can apply this to where s/he lives.

離台多遠 How far from Taiwan (or Paraguay)

World with equidistant small circles 2000 km. apart, originating in Taiwan (or Paraguay), map centered on North America, Taiwan (4 Kb each), and Europe:

Centered on Europe

Program I used on GNU/Linux to make the maps. Raup's gallery does better.

沿著離台等距線之地形 Geographic features aligned along equidistant circles from Taiwan

Km. 線狀地物 Elongated geographic feature
3180 馬六甲海峽中央線 Strait of Malacca axis
3700 印尼之爪哇、帝汶、阿魯 Java, Timor, Aru, Indonesia
5000 印度半島西岸 Indian Peninsula west coast
8200 紅海 Red Sea, Africa / Asia
9000 紐西蘭西岸 New Zealand west coast (except Auckland Peninsula)
10000 已半球 Halfway around the world, 南極洲之威爾克斯地海岸線 Wilkes Land coast, Antarctica
12000-
12600
非洲西岸 Africa west coast: Cape of Good Hope to Nigeria
12300 Lake Erie axis, USA / Canada
12650 紐約長島軸線 Long Island axis, New York
12900 Tennessee / N. Carolina boundary
12950 德州海岸線 Texas coast (except south extreme)
13900 非洲西岸 Africa west coast: Gambia to Sierra Leone
14000 南極洲之科茨地海岸線 Antarctic coast from ~ 10 to 35 west longitude

(原始碼 Source code.) (To compute instead distances from Paraguay, subtract the above number from 20000.) 與之交叉有 Perpendicular to these are 經台之大圓 great circles through Taiwan

http://en.wikipedia.org/wiki/Extreme_points_of_Earth#Along_any_great_circle

最近中國國土 Nearest place in China

尋福建哪理最近我, 竟然先遇台灣所屬之烏坵嶼。 We find the closest place in China to me. It turns out first we meet Taiwan controlled Wuqiu Islands. China is 離華 170 km. away. (原始碼 Source code.) (We also thus find the farthest place in China from (my antipode in) Paraguay.)

Concentric rings from Dan


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積丹尼 Dan Jacobson

Last modified: 2015-09-14 15:48:44 +0800