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2. Radio masts and towers - Wikipedia

   en.wikipedia.org/wiki/Radio_masts_and_towers

   The design designation of these masts is 30107 KM and they are exclusively used for FM and TV and are between 150–200-metre (490–660 ft) tall with one exception. The exception being the mast in Vinnytsia which has height of 354 m (1161 ft) and is currently the tallest guyed tubular mast in the world after the Belmont transmitting station ...

3. Orders of magnitude (length) - Wikipedia

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

   To help compare different orders of magnitude, this section lists lengths between one meter and ten meters. Light, in vacuum, travels 1 meter in 1 ⁄ 299,792,458 , or 3.3356409519815E-9 of a second.

4. Cosmic distance ladder - Wikipedia

   en.wikipedia.org/wiki/Cosmic_distance_ladder

   The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A direct distance measurement of an astronomical object is possible only for those objects that are "close enough" (within about a thousand parsecs ) to Earth.

5. Hong Kong Fire Services Department - Wikipedia

   en.wikipedia.org/wiki/Hong_Kong_Fire_Services...

   Aerial Ladder Platforms (ALP): Carry a telescopic ladder and capable of reaching 47–53 m; The following appliances are mainly deployed to the airport and stations close to fuel depots: First Intervention Vehicle: Carries foam and water and capable of discharging 6000 litres per minute

6. Thirty Meter Telescope - Wikipedia

   en.wikipedia.org/wiki/Thirty_Meter_Telescope

   A 3.1-metre (10 ft) secondary mirror is to produce an unobstructed field-of-view of 20 arcminutes in diameter with a focal ratio of 15. A 3.5-by-2.5-meter (11.5 ft × 8.2 ft) flat tertiary mirror is to direct the light path to science instruments mounted on large Nasmyth platforms. [57] [58] The telescope is to have an alt-azimuth mount. [59]

7. Length measurement - Wikipedia

   en.wikipedia.org/wiki/Length_measurement

   The metre was initially defined using a ruler before more accurate methods became available. Gauge blocks are a common method for precise measurement or calibration of measurement tools. For small or microscopic objects, microphotography where the length is calibrated using a graticule can be used.