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Kincheloe flew 2000 miles per hour (3,200 km/h) at 126,000 feet (38,500 m), or 24 miles up. At this altitude and speed, aerodynamic lift still carries 98 percent of the weight of the plane, and only two percent is carried by inertia, or Kepler force, as space scientists call it. But at 300,000 feet (91,440 m) or 57 miles up, this relationship ...
From 1630 to 1718 a millia was 5,564 feet (1,696 metres), making a geographical league of four millias equal 22,256 feet (6,784 m or 3.663 modern nautical miles). But from 1718 through the 1830s the millia was defined as the equivalent of just over 5,210 feet, giving a shorter geographical league of just over 20,842 feet (6,353 m or 3.430 ...
The standardised Austrian mile used in southern Germany and the Austrian Empire was 7.586 km; the Prussian mile used in northern Germany was 7.5325 km. Following its standardisation by Ole Rømer in the late 17th century, the Danish mile (mil) was precisely equal to the Prussian mile and likewise divided into 24,000 feet. [43]
fjerdingsvei – quarter mile, alt. fjerding, 1/4 mil, i.e. 2.82 km. mil or landmil – Norwegian mile, spelled miil prior to 1862, 18,000 alen (36,000 feet, 7.018 miles or 11.295 km). Before 1683, a mil was defined as 17600 alen or 11.13 km. Another old land-mile, 11.824 km. The unit survives to this day, but in a metric 10 km adaptation
The geographical mile is an international unit of length determined by 1 minute of arc ( 1 / 60 degree) along the Earth's equator. For the international ellipsoid 1924 this equalled 1855.4 metres. [1] The American Practical Navigator 2017 defines the geographical mile as 6,087.08 feet (1,855.342 m). [2]
Roman milestone in modern Austria (AD 201), indicating a distance of 28 Roman miles (~41 km) to Teurnia. The basic unit of Roman linear measurement was the pes (plural: pedes) or Roman foot. Investigation of its relation to the English foot goes back at least to 1647, when John Greaves published his Discourse on the Romane foot.
This was usually standardized at the value of 20,000 feet, although the foot varied over time and from region to region. The Amsterdam foot produced a mijl of around 3.52 miles or 5.66 km, while the Rhenish foot produced one of 3.9 miles or 6.28 km. In specific contexts, a separate mile might be used.
Milestone at Ballycarrane, stating that it is 8 Irish miles (16 km) to Rathkeale and 6 Irish miles (12 km) to Limerick. Irish measure or plantation measure was a system of units of land measurement used in Ireland from the 16th century plantations until the 19th century, with residual use into the 20th century.