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In contrast, the Lunar distance (LD or ), or Earth–Moon characteristic distance, is a unit of measure in astronomy. More technically, it is the semi-major axis of the geocentric lunar orbit . The average lunar distance is approximately 385,000 km (239,000 mi), or 1.28 light-seconds ; this is roughly 30 times Earth's diameter .
It can be seen that the measured range is 238,000 mi (383,000 km), approximately the distance from the Earth to the Moon. QSL card for reception reports. Project Diana, named for the Roman moon goddess Diana, was an experimental project of the US Army Signal Corps in 1946 to bounce radar signals off the Moon and receive the reflected signals. [1]
In celestial navigation, lunar distance, also called a lunar, is the angular distance between the Moon and another celestial body. The lunar distances method uses this angle and a nautical almanac to calculate Greenwich time if so desired, or by extension any other time. That calculated time can be used in solving a spherical triangle.
Six retroreflectors were left at six sites on the Moon by three crews of the Apollo program, two by remote landers of the Lunokhod program, and one by the Chandrayaan program. [1] Lunar reflectors have enabled precise measurement of the Earth–Moon distance since 1969 using lunar laser ranging. [2]
In 1982 researchers from Earlham College in Richmond, Indiana concluded that the complex was a lunar observatory, designed to track motions of the moon, including the northernmost point of the 18.6-year cycle of the lunar orbit. When viewed from the observatory mound, the moon rises at that time within one-half of a degree of the octagon's ...
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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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