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  2. Span (unit) - Wikipedia

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

    Span (unit) Some hand-based measurements, including the great span (4) A span is the distance measured by a human hand, from the tip of the thumb to the tip of the little finger. In ancient times, a span was considered to be half a cubit. Sometimes the distinction is made between the great span or full span (thumb to little finger) and little ...

  3. Two-second rule - Wikipedia

    en.wikipedia.org/wiki/Two-second_rule

    The two-second rule is a rule of thumb by which a driver may maintain a safe trailing distance at any speed. [1][2] The rule is that a driver should ideally stay at least two seconds behind any vehicle that is directly in front of his or her vehicle. It is intended for automobiles, although its general principle applies to other types of vehicles.

  4. Digit ratio - Wikipedia

    en.wikipedia.org/wiki/Digit_ratio

    The hand is placed on the edge of a table so that fingers are rested on table while making an angle of 90 degrees to the palm. The digit ratio is a pseudoscience involving the ratio taken of the lengths of different digits or fingers on a hand. The most commonly studied digit ratio is that of the 2nd (index finger) and 4th (ring finger), also ...

  5. System of units of measurement - Wikipedia

    en.wikipedia.org/wiki/System_of_units_of_measurement

    In antiquity, systems of measurement were defined locally: the different units might be defined independently according to the length of a king's thumb or the size of his foot, the length of stride, the length of arm, or maybe the weight of water in a keg of specific size, perhaps itself defined in hands and knuckles.

  6. Naismith's rule - Wikipedia

    en.wikipedia.org/wiki/Naismith's_rule

    That is, 7.92 units of distance are equivalent to 1 unit of climb. For convenience an 8 to 1 rule can be used. So, for example, if a route is 20 kilometres (12 mi) with 1600 metres of climb (as is the case on leg 1 of the Bob Graham Round , Keswick to Threlkeld), the equivalent flat distance of this route is 20+(1.6×8)=32.8 kilometres (20.4 mi).

  7. Ancient Greek units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_units_of...

    distance from thumb-tip to tip of outstretched index finger [2] orthodōron ὀρθόδωρον: 11 daktyloi 211.9 mm (8.34 in) straight hand's width spithamē σπιθαμή: 12 daktyloi 231.2 mm (9.10 in) span of all fingers pous πούς: 16 daktyloi 308.2 mm (12.13 in) foot: pygmē πυγμή: 18 daktyloi 346.8 mm (13.65 in) forearm pygōn

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    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

  9. Angular diameter - Wikipedia

    en.wikipedia.org/wiki/Angular_diameter

    an object of diameter 725.27 km at a distance of 1 astronomical unit (AU) an object of diameter 45 866 916 km at 1 light-year; an object of diameter 1 AU (149 597 871 km) at a distance of 1 parsec (pc) Thus, the angular diameter of Earth's orbit around the Sun as viewed from a distance of 1 pc is 2″, as 1 AU is the mean radius of Earth's orbit.

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