“21st parallel north”的意思、由来-开放百科全书

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21st parallel north

释义

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The 21st parallel north is a circle of latitude that is 21 degrees north of the Earth's equatorial plane. It crosses Africa, Asia, the Indian Ocean, the Pacific Ocean, North America, the Caribbean and the Atlantic Ocean.

At this latitude the sun is visible for 13 hours, 25 minutes during the summer solstice and 10 hours, 51 minutes during the winter solstice.^[1]

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Starting at the Prime Meridian and heading eastwards, the parallel 21° north passes through:

Co-ordinates	Country, territory or sea	Notes
21\|0\|N\|0\|0\|E\|type:landmark\|name=Prime Meridian}}	{{MLI
21\|0\|N\|1\|11\|E\|type:country\|name=Algeria}}	{{DZA
21\|0\|N\|7\|42\|E\|type:country\|name=Niger}}	{{NER
21\|0\|N\|15\|36\|E\|type:country\|name=Chad}}	{{TCD
21\|0\|N\|21\|5\|E\|type:country\|name=Libya}}	{{LBY
21\|0\|N\|25\|0\|E\|type:country\|name=Sudan}}	{{SDN
{{Coord\|21\|0\|N\|37\|7\|E\|type:waterbody\|name=Red Sea}}	Red Sea
21\|0\|N\|39\|17\|E\|type:country\|name=Saudi Arabia}}	{{SAU
21\|0\|N\|55\|20\|E\|type:country\|name=Oman}}	{{OMN
{{Coord\|21\|0\|N\|58\|48\|E\|type:waterbody\|name=Indian Ocean}}	Indian Ocean	Arabian Sea
21\|0\|N\|70\|14\|E\|type:country\|name=India}}	{{IND	Gujarat - Kathiawar peninsula
{{Coord\|21\|0\|N\|71\|40\|E\|type:waterbody\|name=Indian Ocean}}	Indian Ocean	Gulf of Khambhat
21\|0\|N\|72\|44\|E\|type:country\|name=India}}	{{IND	Gujarat Maharashtra Chhattisgarh Orissa
{{Coord\|21\|0\|N\|86\|53\|E\|type:waterbody\|name=Indian Ocean}}	Indian Ocean	Bay of Bengal
21\|0\|N\|92\|11\|E\|type:country\|name=Bangladesh}}	{{BGD
21\|0\|N\|92\|16\|E\|type:country\|name=Myanmar}}	{{MMR (Burma)
21\|0\|N\|100\|33\|E\|type:country\|name=Laos}}	{{LAO
21\|0\|N\|103\|4\|E\|type:country\|name=Vietnam}}	{{VNM	Mainland and some islands; passing through Hanoi
{{Coord\|21\|0\|N\|107\|50\|E\|type:waterbody\|name=South China Sea}}	South China Sea	Gulf of Tonkin - passing just south of Weizhou Island, Guangxi, {{PRC}}
21\|0\|N\|109\|41\|E\|type:country\|name=China}}	{{PRC	Guangdong (Leizhou Peninsula and Donghai Island)
{{Coord\|21\|0\|N\|110\|31\|E\|type:waterbody\|name=South China Sea}}	South China Sea	Passing just south of Mavudis island, {{PHL}}
{{Coord\|21\|0\|N\|121\|56\|E\|type:waterbody\|name=Pacific Ocean}}	Pacific Ocean	Passing between Molokai and Lanai islands, Hawaii, {{USA}}
21\|0\|N\|156\|40\|W\|type:country\|name=United States}}	{{USA	Island of Maui, Hawaii
{{Coord\|21\|0\|N\|156\|33\|W\|type:waterbody\|name=Pacific Ocean}}	Pacific Ocean
21\|0\|N\|105\|20\|W\|type:country\|name=Mexico}}	{{MEX	passing just south of León, Guanajuato
{{Coord\|21\|0\|N\|97\|19\|W\|type:waterbody\|name=Gulf of Mexico}}	Gulf of Mexico	Bay of Campeche
21\|0\|N\|90\|20\|W\|type:country\|name=Mexico}}	{{MEX	Yucatán Peninsula - passing just north of Mérida
{{Coord\|21\|0\|N\|86\|49\|W\|type:waterbody\|name=Caribbean Sea}}	Caribbean Sea
21\|0\|N\|79\|13\|W\|type:country\|name=Cuba}}	{{CUB	Doce Leguas Cays
{{Coord\|21\|0\|N\|79\|10\|W\|type:waterbody\|name=Caribbean Sea}}	Caribbean Sea
21\|0\|N\|78\|26\|W\|type:country\|name=Cuba}}	{{CUB
{{Coord\|21\|0\|N\|75\|34\|W\|type:waterbody\|name=Atlantic Ocean}}	Atlantic Ocean
21\|0\|N\|73\|42\|W\|type:country\|name=Bahamas}}	{{BHS	Great Inagua island
{{Coord\|21\|0\|N\|73\|8\|W\|type:waterbody\|name=Atlantic Ocean}}	Atlantic Ocean	Passing to the south of the southernmost cays of the {{TCA}}
21\|0\|N\|17\|3\|W\|type:country\|name=Western Sahara}}	Western Sahara	Claimed by {{MAR}} - Ras Nouadhibou peninsula
21\|0\|N\|17\|2\|W\|type:country\|name=Mauritania}}	{{MRT	Ras Nouadhibou peninsula
{{Coord\|21\|0\|N\|17\|0\|W\|type:waterbody\|name=Atlantic Ocean}}	Atlantic Ocean
21\|0\|N\|16\|50\|W\|type:country\|name=Mauritania}}	{{MRT
21\|0\|N\|6\|6\|W\|type:country\|name=Mali}}	{{MLI

References

1. ^http://aa.usno.navy.mil/data/docs/Dur_OneYear.php

1 : Lines of latitude

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