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A laser rangefinder, also known as a laser telemeter, is a rangefinder that uses a laser beam to determine the distance to an object. The most common form of laser rangefinder operates on the time of flight principle by sending a laser pulse in a narrow beam towards the object and measuring the time taken by the pulse to be reflected off the ...
This is a list of NCAA outdoor champions in the 3000 meters steeplechase. Hand timing was used until 1973, while starting in 1974 fully automatic timing was used. The women's event was introduced in 2001.
60 meter dash (1999–present) 200 meter dash (1988–present) 400 meter dash (1984–present) Distance events. 800 meter run (1965–present) Mile run (1965–present) 3,000 meter run (1965–present) 5,000 meter run (1989–present) Hurdle Events. 60 meter hurdles (1999–present) Relay events. 1,600 meter relay (1965–present) Distance ...
Lunar Laser Ranging (LLR) is the practice of measuring the distance between the surfaces of the Earth and the Moon using laser ranging. The distance can be calculated from the round-trip time of laser light pulses travelling at the speed of light , which are reflected back to Earth by the Moon's surface or by one of several retroreflectors ...
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Paavo Nurmi setting a 3,000 m world record in Berlin in 1926. The following tables shows the world record progression in the Men's 3000 metres. The International Amateur Athletics Federation, now known as the International Association of Athletics Federations, ratified its first world record in the event in 1912.