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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. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    Leonardo da Vinci drew the Vitruvian Man within a square of side 1.83 m (6 ft 0 in) and a circle about 1.2 m (3 ft 11 in) in radius. To help compare different orders of magnitude , this section lists lengths between one meter and ten meters.

  4. 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.

  5. Geographical distance - Wikipedia

    en.wikipedia.org/wiki/Geographical_distance

    = 6,371.009 kilometers = 3,958.761 statute miles = 3,440.069 nautical miles. = Distance between the two points, as measured along the surface of the Earth and in the same units as the value used for radius unless specified otherwise.

  6. Figure of the Earth - Wikipedia

    en.wikipedia.org/wiki/Figure_of_the_Earth

    Regardless of the model, any radius falls between the polar minimum of about 6,357 km (3,950 mi) and the equatorial maximum of about 6,378 km (3,963 mi). The difference 21 km (13 mi) correspond to the polar radius being approximately 0.3% shorter than the equatorial radius.

  7. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    the statistical confidence interval or tolerance interval of the initial measurement; the number of significant figures of the measurement; the intended use of the measurement, including the engineering tolerances; historical definitions of the units and their derivatives used in old measurements; e.g., international foot vs. US survey foot.

  8. 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.

  9. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [1] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.

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