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The physical group size equivalent to m minutes of arc can be calculated as follows: group size = tan( m / 60 ) × distance. In the example previously given, for 1 minute of arc, and substituting 3,600 inches for 100 yards, 3,600 tan( 1 / 60 ) ≈ 1.047 inches. In metric units 1 MOA at 100 metres ≈ 2.908 centimetres.
Area; system unit code (alternative) QID symbol or abbrev. notes sample default conversion combinations SI: square kilometre: km2 Q712226: km 2: US spelling: square kilometer 1.0 km 2 (0.39 sq mi)
The use of the parsec as a unit of distance follows naturally from Bessel's method, because the distance in parsecs can be computed simply as the reciprocal of the parallax angle in arcseconds (i.e.: if the parallax angle is 1 arcsecond, the object is 1 pc from the Sun; if the parallax angle is 0.5 arcseconds, the object is 2 pc away; etc.).
One acre equals 1 ⁄ 640 (0.0015625) square mile, 4,840 square yards, 43,560 square feet, [2] or about 4,047 square metres (0.4047 hectares) (see below).While all modern variants of the acre contain 4,840 square yards, there are alternative definitions of a yard, so the exact size of an acre depends upon the particular yard on which it is based.
[1] [2] In Jersey, a vergée (Jèrriais: vrégie) is 19,360 square feet (1,798.6 m 2). It is 40 (square) Jersey perches. A Jersey perch (also spelt pèrque) is a square 24 pied de perche on each side (i.e. a square 22 imperial feet on each side). [3] An inscribed stone describes this 11 vergée 25 perch clos des pauvres in Jersey
For example, in order to form an image in yellow light with a wavelength of 580 nm, for a resolution of 1 milli-arcsecond, we need telescopes laid out in an array that is 120 m × 120 m with a dimensional precision better than 145 nm.
In Arkansas and Missouri, the official conversion is 1 arpent = 0.8507 acres (3,443 square metres). [3] In Paris, the square arpent was 220 French feet × 220 French feet = 48,400 French square feet, about 5,107 square metres or 1.262 acres. In Mauritius and Seychelles, an arpent is about 4220.87 square metres, 0.4221 hectares, 1.043 acres. [4]
The precise conversion is 1 cuerda = 3,930.395625 m 2. [2] The term "Spanish acre" instead has been used sometimes by mainlanders. [1] A cuerda and an acre have often been treated as equal because they are nearly the same size. According to Carlos Menocal Villagran, [3] in Guatemala, the term cuerda refers to a unit of area and can have various ...