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  2. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    A ruler, depicting two customary units of length, the centimeter and the inch. A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length.

  3. History of longitude - Wikipedia

    en.wikipedia.org/wiki/History_of_longitude

    Eratosthenes in the 3rd century BC first proposed a system of latitude and longitude for a map of the world. His prime meridian (line of longitude) passed through Alexandria and Rhodes, while his parallels (lines of latitude) were not regularly spaced, but passed through known locations, often at the expense of being straight lines. [1]

  4. Length - Wikipedia

    en.wikipedia.org/wiki/Length

    Length is a measure of distance.In the International System of Quantities, length is a quantity with dimension distance. In most systems of measurement a base unit for length is chosen, from which all other units are derived.

  5. Metre - Wikipedia

    en.wikipedia.org/wiki/Metre

    The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of ⁠ 1 / 299 792 458 ⁠ of a second, where the second is defined by a hyperfine transition frequency of caesium.

  6. Income inequality metrics - Wikipedia

    en.wikipedia.org/wiki/Income_inequality_metrics

    Income inequality metrics or income distribution metrics are used by social scientists to measure the distribution of income and economic inequality among the participants in a particular economy, such as that of a specific country or of the world in general.

  7. Bridge of the Americas - Wikipedia

    en.wikipedia.org/wiki/Bridge_of_the_Americas

    The Bridge of the Americas (Spanish: Puente de las Américas; originally known as the Thatcher Ferry Bridge) is a road bridge in Panama which spans the Pacific entrance to the Panama Canal.

  8. Monumento a la Revolución - Wikipedia

    en.wikipedia.org/wiki/Monumento_a_la_Revolución

    The structure remained unfinished for twenty-five years, until the presidency of Lázaro Cárdenas, [3] when Mexican architect Carlos Obregón Santacilia proposed converting the abandoned shell of the dome into a monument to the heroes of the Mexican Revolution.