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  2. Dammam railway station - Wikipedia

    en.wikipedia.org/wiki/Dammam_railway_station

    The present passenger railway line (Dammam-Riyadh Railway Line 1) from Riyadh to Dammam via Buqayq and Hofuf, measuring 449 km (279 mi), was completed in 1985. Along with the decrease in distance, this shortened the time taken for the journey between the two cities from 7 hours to 5 hours.

  3. King Khalid International Airport - Wikipedia

    en.wikipedia.org/wiki/King_Khalid_International...

    The hand-cut glass and marble mosaic, measuring 250 square metres (2,700 sq ft) and fabricated with Clarke's assistance, was the largest in the world at the time. [23] The dome's apex, at 40 metres (131 ft 3 in) above the arrivals level roadway, is higher than all the other structures in the passenger complex with the exception of the control ...

  4. Length measurement - Wikipedia

    en.wikipedia.org/wiki/Length_measurement

    Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured. The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light .

  5. Category : Length, distance, or range measuring devices

    en.wikipedia.org/wiki/Category:Length,_distance...

    Pages in category "Length, distance, or range measuring devices" The following 60 pages are in this category, out of 60 total. This list may not reflect recent changes. *

  6. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    Astronomical measure uses: Earth radius R 馃湪 ≈ 6,371 km [14] Lunar distance LD ≈ 384 402 km. [15] Average distance between the center of Earth and the center of the Moon. astronomical unit au. Defined as 149 597 870 700 m. [16] Approximately the distance between the Earth and Sun. light-year ly ≈ 9 460 730 472 580.8 km.

  7. Distance measuring equipment - Wikipedia

    en.wikipedia.org/wiki/Distance_measuring_equipment

    In aviation, distance measuring equipment (DME) is a radio navigation technology that measures the slant range (distance) between an aircraft and a ground station by timing the propagation delay of radio signals in the frequency band between 960 and 1215 megahertz (MHz). Line-of-visibility between the aircraft and ground station is required.

  8. League (unit) - Wikipedia

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

    Ottoman units of measurement: 2,065: Portugal: 2,220: Gallo-Roman league: Gallo-Roman culture: 1 + 1 ⁄ 2 miles: Under the reign of Emperor Septimius Severus, this replaced the Roman mile as the official unit of distance in the Gallic and Germanic provinces, although there were regional and temporal variations. [11] 2,470: Sardinia, Piemont ...

  9. Distance measure - Wikipedia

    en.wikipedia.org/wiki/Distance_measure

    Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe.They are often used to tie some observable quantity (such as the luminosity of a distant quasar, the redshift of a distant galaxy, or the angular size of the acoustic peaks in the cosmic microwave background (CMB) power spectrum) to another quantity that is ...

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