348:
notes that "The international nautical mile of 1,852 meters (6,076.115 49... feet) was adopted effective July 1, 1954, for use in the United States. The value formerly used in the United States was 6,080.20 feet = 1 nautical (geographical or sea) mile." This deprecated value of 6,080.2 feet is
317:
degree—to produce a distance now notionally equal to 7,408 metres (24,304 ft) but actually differing slightly depending on official measurements and computations. (For example, the Danish unit was computed as equivalent to about 7,421.5 metres (24,349 ft) by the astronomer
349:
equivalent to 1,853.24 m. A separate reference identifies the geographic mile as being identical to the international nautical mile of 1,852 m and slightly shorter than the
British nautical mile of 6,080 feet (1,853.18 m).
301:) all approximated their much longer miles—equivalent to English leagues—by using a larger division of the equatorial degree. Instead of using one minute of arc, they all used four—
410:
of ten geographical miles square, each mile containing 6,086 and 4-10ths of a foot" and "sub-divided into lots of one mile square each, or 850 and 4-10ths of an acre".
484:
345:
611:
398:
laws. For example, Section 1301(a) of the
Submerged Lands Act defines state seaward boundaries in terms of geographic miles. While debating what became the
189:(which was historically linked to the circumference measured through both poles); one geographic mile is equivalent to approximately 1.00178 nautical miles.
599:"NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices, General Tables of Units of Measurement
649:
499:
185:
being 0.168% larger when measured around the equator as compared to through the poles. The geographical mile is slightly larger than the
683:
582:
468:
540:
174:, which makes the geographical mile 1,855.3248 m. The rounding of the Earth's radius to metres in GRS80 has an effect of 0.0001 m.
142:
201:
159:
700:
167:
146:
2017 defines the geographical mile as 6,087.08 feet (1,855.342 m). Greater precision depends more on the choice of the
424:
407:
377:
598:
292:
276:
246:
degree, approximating the values provided above; and when divided into 25 leagues, the geographical mile was equal to
214:
of three separate values. When each equatorial degree was divided into 18 leagues, the geographical mile was equal to
367:
266:
230:
degree or about 2.06 kilometres (1.28 mi); when divided into 20 leagues, the geographical mile was equal to
734:
182:
399:
636:
514:
This is used by the international (ITRS) and
American WGS 84) coordinate reference system for the world.
637:"Units of Weight and Measure (United States Customary and Metric) Definition and Tables of Equivalents"
197:
Historically, certain nations used slightly different divisions to create their geographical miles.
714:
419:
478:
178:
75:
702:
A Century of
Lawmaking for a New Nation: U.S. Congressional Documents and Debates, 1774 - 1875
679:
578:
464:
211:
147:
133:
403:
151:
525:
158:
varies more than 100 metres (328.084 ft) along the equator. In any ellipsoid, the
121:
71:
728:
436:
395:
353:
337:
331:
186:
102:
574:
567:
504:, vol. II (2017 ed.), National Geospatial-Intelligence Agency, p. 346
341:
319:
356:
up to the beginning of the 20th century, causing it to be more well known as the
459:
Ministry of
Defence Staff, Navy Dept, Great Britain Ministry of Defence (1987).
89:
394:
The unit is not used much in
English-speaking countries but is cited in some
162:
at the equator is exactly 60 geographical miles. The Earth's radius at the
344:
of the Earth but is nowadays defined by treaty as exactly 1,852 m. The US
52:
352:
Scandinavians used their own version of the geographical mile as their
163:
129:
155:
137:
125:
61:
610:(Report). November 2014. p. C-15 (Appendix C, footnote 14).
406:'s committee wanted to divide the public lands in the west into "
644:
606:
430:
85:
676:
CRC Handbook of
Chemistry and Physics, 62nd edition, 1981-1982
340:, which was originally determined as 1 minute of arc along a
154:
than on more careful measurement, since the radius of the
181:
is a slightly flattened sphere, which results in the
101:is an international unit of length determined by 1
67:
48:
26:
21:
566:
678:. Boca Raton, Florida: CRC Press. p. F-297.
427:for details of the geographical league of France
336:The geographical mile is closely related to the
262:degree or about 1.48 kilometres (0.92 mi).
205:
346:National Institute of Standards and Technology
565:David Greenhood; Gerard L. Alexander (1964).
381:
8:
699:"Journal of Continental Congress, Vol. 27".
483:: CS1 maint: multiple names: authors list (
371:
361:
296:
286:
280:
454:
452:
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265:The geographical miles of the traditional
18:
573:. University of Chicago Press. pp.
16:Unit of length of approximately 1855.3 m
448:
476:
463:. H.M. Stationery Office. p. 7.
7:
648:(Report). July 1, 1955. p. 4.
326:Relationship with the nautical mile
433:for the various other miles in use
14:
498:"Glossary of Marine Navigation",
30:
501:The American Practical Navigator
143:The American Practical Navigator
655:from the original on 2017-02-01
617:from the original on 2017-05-05
546:from the original on 2011-07-15
160:length of a degree of longitude
461:Admiralty manual of navigation
1:
425:Medieval weights and measures
645:National Bureau of Standards
533:The Abraham Zelmanov Journal
134:international ellipsoid 1924
705:. May 28, 1784. p. 446
751:
524:Rabounski, Dmitri (2008).
329:
44:
32:1 geographical mile
674:Weast, Robert C. (ed.).
526:"Biography of Ole Rømer"
400:Land Ordinance of 1785
382:
372:
362:
297:
287:
281:
271:
206:
204:derived their miles (
183:Earth's circumference
172:6,378,137.0000 m
136:this equalled 1855.4
715:Library of congress
420:Conversion of units
282:geographische Meile
39:... is equal to ...
210:) as one third of
179:shape of the Earth
82:
69:
58:
50:
272:geografische mijl
202:Portuguese system
99:geographical mile
95:
94:
27:Conversions
22:Geographical mile
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719:
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404:Thomas Jefferson
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255:
252:
245:
243:
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236:
229:
227:
226:
223:
220:
209:
207:milha geográfica
193:Historical units
173:
120:
118:
117:
114:
111:
83:
70:
59:
51:
19:
750:
749:
745:
744:
743:
741:
740:
739:
735:Units of length
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724:
723:
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328:
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195:
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115:
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109:
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106:
88:or ~6,087
81:
68:
57:
49:
17:
12:
11:
5:
748:
746:
738:
737:
727:
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721:
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691:
685:978-0849304620
684:
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628:
590:
583:
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469:
447:
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428:
422:
415:
412:
391:
388:
330:Main article:
327:
324:
298:geografisk mil
293:Danish systems
194:
191:
148:Earth's radius
93:
92:
79:
65:
64:
55:
46:
45:
42:
41:
36:
29:
28:
24:
23:
15:
13:
10:
9:
6:
4:
3:
2:
747:
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584:9780226306971
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470:9780117728806
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437:Nautical mile
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411:
409:
405:
401:
397:
396:United States
389:
387:
384:
379:
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364:
359:
355:
354:nautical mile
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347:
343:
339:
338:nautical mile
333:
332:Nautical mile
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213:
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198:
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187:nautical mile
184:
180:
175:
170:ellipsoid is
169:
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153:
149:
145:
144:
139:
135:
131:
127:
123:
104:
103:minute of arc
100:
91:
87:
84:~1.1528
80:
77:
73:
66:
63:
56:
54:
47:
43:
40:
37:
35:
31:
25:
20:
713:– via
707:. Retrieved
701:
694:
675:
669:
657:. Retrieved
643:
631:
619:. Retrieved
605:
593:
568:
560:
548:. Retrieved
536:
532:
519:
510:
500:
493:
460:
393:
357:
351:
342:great circle
335:
264:
212:their league
199:
196:
176:
150:of the used
141:
124:) along the
98:
96:
38:
33:
360:in Danish (
550:1 February
443:References
132:. For the
479:cite book
368:Norwegian
320:Ole Rømer
288:Landmeile
152:ellipsoid
60:~1,855.3
729:Category
709:April 9,
650:Archived
621:April 9,
612:Archived
541:Archived
414:See also
408:hundreds
358:sea mile
72:imperial
53:SI units
569:Mapping
378:Swedish
376:), and
315:
303:
291:), and
260:
248:
244:
232:
228:
216:
166:in the
164:equator
130:equator
119:
107:
682:
659:May 5,
581:
467:
383:sjömil
373:sjømil
277:German
138:metres
122:degree
34:in ...
653:(PDF)
640:(PDF)
615:(PDF)
602:(PDF)
575:51–52
544:(PDF)
539:: 2.
529:(PDF)
363:sømil
267:Dutch
168:GRS80
156:geoid
126:Earth
78:units
711:2019
680:ISBN
661:2021
623:2019
607:NIST
579:ISBN
552:2018
485:link
465:ISBN
431:Mile
322:.)
200:The
177:The
97:The
390:Use
386:).
366:),
285:or
275:),
128:'s
731::
642:.
604:.
577:.
535:.
531:.
481:}}
477:{{
451:^
402:,
312:15
257:75
241:60
225:54
140:.
116:60
90:ft
86:mi
76:US
717:.
688:.
663:.
625:.
587:.
554:.
537:1
487:)
473:.
380:(
370:(
309:/
306:1
295:(
279:(
269:(
254:/
251:1
238:/
235:1
222:/
219:1
113:/
110:1
105:(
74:/
62:m
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