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Milestone on Mountbellew Bridge, originally erected near by c.1760. Distances are given in Irish miles to: Dublin (79); Athlone (20) Ballyforan (9) Ballinasloe (2); Galway (23) Tuam (12) Dunmore (2) Detail of John Rocque's 1794 map of Ireland showing scales of English and Irish miles Milestone on the N2 road reading: Slane 5, Carrickmacross 21 and Collon 9 (Irish) miles.
Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...
The mile, sometimes the international mile or statute mile to distinguish it from other miles, is a British imperial unit and United States customary unit of length; both are based on the older English unit of length equal to 5,280 English feet, or 1,760 yards. The statute mile was standardised between the Commonwealth of Nations and the United ...
The statute mile was introduced in 1592 during the reign of Queen Elizabeth I: 1,609.344: mile: some English speaking countries [citation needed] 1959: today: 1,760 yards: On 1 July 1959, the imperial mile was standardized to an exact length in metres 1,609.3472 (statute) mile: United States: 1893: today: 1,760 yards: From 1959; also called the ...
These signs give the same location information as distance marker posts, but more visibly on larger signs, which are generally placed at 500-metre (550-yard) intervals. If obstacles prevent signs from being spaced at 500-metre intervals, then the interval must be reduced to either 400 or 300 metres (440 or 330 yd).
d = run Δh = rise l = slope length α = angle of inclination. The grade (US) or gradient (UK) (also called stepth, slope, incline, mainfall, pitch or rise) of a physical feature, landform or constructed line is either the elevation angle of that surface to the horizontal or its tangent.
The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.
Respectively, these square divisions of land are approximately 80 chains (one mile or 1.6 km), 40 chains (half a mile or 800 m), and 20 chains (a quarter mile or 400 m) on a side. The chain is still used in agriculture: measuring wheels with a circumference of 0.1 chain (diameter ≈ 2.1 ft or 64 cm) are still readily available in Canada and ...
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