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  2. On the Sizes and Distances (Aristarchus) - Wikipedia

    en.wikipedia.org/wiki/On_the_Sizes_and_Distances...

    Radius of the Moon: s: Radius of the Sun: t: Radius of the Earth: D: Distance from the center of Earth to the vertex of Earth's shadow cone d: Radius of the Earth's shadow at the location of the Moon n: Ratio, d/ℓ (a directly observable quantity during a lunar eclipse) x: Ratio, S/L = s/ℓ (which is calculated from φ)

  3. Chebyshev distance - Wikipedia

    en.wikipedia.org/wiki/Chebyshev_distance

    On a chessboard, where one is using a discrete Chebyshev distance, rather than a continuous one, the circle of radius r is a square of side lengths 2r, measuring from the centers of squares, and thus each side contains 2r+1 squares; for example, the circle of radius 1 on a chess board is a 3×3 square.

  4. 20K run - Wikipedia

    en.wikipedia.org/wiki/20K_run

    The 20K run (20 kilometres, or approximately 12.4 miles) is a long distance foot race.It is a rarely held race that is not recognized as an Olympic event. The event held IAAF world championship status in 2006 only, when the existing IAAF World Half Marathon Championships briefly hosted the shorter distance.

  5. Geographical distance - Wikipedia

    en.wikipedia.org/wiki/Geographical_distance

    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.

  6. League (unit) - Wikipedia

    en.wikipedia.org/wiki/League_(unit)

    Légua of 20 to a degree (Maritime légua) = 5,555.56 metres; Légua of 25 to a degree = 4,444.44 metres; The names of the several léguas referred to the number of units that made the length corresponding to an angle degree of a meridian arc. For compatibility after Portugal adopted the metric system, the metric légua of 5.0 km was used.

  7. Distance - Wikipedia

    en.wikipedia.org/wiki/Distance

    One may measure the distance between the closest points of the two objects; in this sense, the altitude of an airplane or spacecraft is its distance from the Earth. The same sense of distance is used in Euclidean geometry to define distance from a point to a line , distance from a point to a plane , or, more generally, perpendicular distance ...

  8. Template:Convert - Wikipedia

    en.wikipedia.org/wiki/Template:Convert

    Converts measurements to other units. Template parameters [Edit template data] This template prefers inline formatting of parameters. Parameter Description Type Status Value 1 The value to convert. Number required From unit 2 The unit for the provided value. Suggested values km2 m2 cm2 mm2 ha sqmi acre sqyd sqft sqin km m cm mm mi yd ft in kg g mg lb oz m/s km/h mph K C F m3 cm3 mm3 L mL cuft ...

  9. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    American surveyors use a decimal-based system of measurement devised by Edmund Gunter in 1620. The base unit is Gunter's chain of 66 feet (20 m) which is subdivided into 4 rods, each of 16.5 ft or 100 links of 0.66 feet. A link is abbreviated "lk", and links "lks", in old deeds and land surveys done for the government.

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