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ranging fire - translation to spanish
![LRRR]])](https://commons.wikimedia.org/wiki/Special:FilePath/ALSEP AS14-67-9386.jpg?width=200 "LRRR]])")
![APOLLO]] collaboration photon pulse return times](https://commons.wikimedia.org/wiki/Special:FilePath/LunarPhotons.png?width=200 "APOLLO]] collaboration photon pulse return times")
![Wettzell]] [[fundamental station]], [[Bavaria]], [[Germany]]](https://commons.wikimedia.org/wiki/Special:FilePath/Wettzell Laser Ranging System.jpg?width=200 "Wettzell]] [[fundamental station]], [[Bavaria]], [[Germany]]")
![Laser Ranging at [[Goddard Space Flight Center]]](https://commons.wikimedia.org/wiki/Special:FilePath/Goddard Spaceflight Center Laser Ranging Facility.jpg?width=200 "Laser Ranging at [[Goddard Space Flight Center]]")
![Wiltshire Fire Brigade]]](https://commons.wikimedia.org/wiki/Special:FilePath/Dennis1951FireTender.jpg?width=200 "Wiltshire Fire Brigade]]")
![Areal photograph of a public display by the [[German Fire Services]]](https://commons.wikimedia.org/wiki/Special:FilePath/Einsatzfahrzeuge.jpg?width=200 "Areal photograph of a public display by the [[German Fire Services]]")
![Plaque with the history of the department in [[Haddonfield, New Jersey]]](https://commons.wikimedia.org/wiki/Special:FilePath/Haddonfield fire department history.jpg?width=200 "Plaque with the history of the department in [[Haddonfield, New Jersey]]")
![[[Knox Automobile]] produced the first modern fire engine in 1905](https://commons.wikimedia.org/wiki/Special:FilePath/Knoxfireengine.jpg?width=200 "[[Knox Automobile]] produced the first modern fire engine in 1905")
![Fire Station No. 1 in [[Los Angeles]], [[California]], United States, one of over 100 stations in the [[Los Angeles Fire Department]]](https://commons.wikimedia.org/wiki/Special:FilePath/LAFD Station - 1.JPG?width=200 "Fire Station No. 1 in [[Los Angeles]], [[California]], United States, one of over 100 stations in the [[Los Angeles Fire Department]]")
![A [[Fire and Rescue NSW]] truck in 2008](https://commons.wikimedia.org/wiki/Special:FilePath/NSW Fire Brigades Pumper Class 2 and rescue.jpg?width=200 "A [[Fire and Rescue NSW]] truck in 2008")
![Firefighters taking part in a training exercise in [[Vaughan]], [[Ontario]], Canada](https://commons.wikimedia.org/wiki/Special:FilePath/Vaughan Fire training.jpg?width=200 "Firefighters taking part in a training exercise in [[Vaughan]], [[Ontario]], Canada")
Definition
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Wikipedia
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 five retroreflectors installed on the Moon during the Apollo program (11, 14, and 15) and Lunokhod 1 and 2 missions.
Although it is possible to reflect light or radio waves directly from the Moon's surface (a process known as EME), a much more precise range measurement can be made using retroreflectors, since because of their small size, the temporal spread in the reflected signal is much smaller.
A review of Lunar Laser Ranging is available.
Laser ranging measurements can also be made with retroreflectors installed on Moon-orbiting satellites such as the LRO.
