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The locations of lunar retroreflectors left by Apollo (A) and Luna (L) missions. Retroreflectors are devices which reflect light back to its source. 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, one by the Commercial Lunar Payload Services program and one by the Chandrayaan program. [1]
Annotated image of the near side of the Moon showing the location of retroreflectors left on the surface by Apollo and Lunokhod missions [19]. The distance to the Moon is calculated approximately using the equation: distance = (speed of light × duration of delay due to reflection) / 2.
Oceans reflect the least amount of light, roughly 10%. Land reflects 10–25% of sunlight, and clouds reflect around 50%. Thus, the part of Earth where it is daytime and from where the Moon is visible determines how bright the earthshine on the Moon appears at any given time. Earthshine reflected from the Moon during conjunction with Venus (left)
Best visible shortly before or after a new moon (during the waning and waxing crescent phases respectively), Earthshine is the faint glow of the non-illuminated (night) side of the Moon caused by sunlight reflecting off the surface of Earth (which would appear nearly full to an observer situated on the Moon at this time) and onto the night side ...
The Moon's surface can scatter a laser beam and produce a sufficiently strong enough signal to be detected on Earth, resulting in ranging measurements that were accurate to within 120 meters (390 ft). Beyond this though the effects of terrain became problematic, and when combined with a returned signal strength that is both weak and temporally ...
The English proper name for Earth's natural satellite is typically written as Moon, with a capital M. [19] [20] The noun moon is derived from Old English mōna, which stems from Proto-Germanic *mēnōn, [21] which in turn comes from Proto-Indo-European *mēnsis 'month' [22] (from earlier *mēnōt, genitive *mēneses) which may be related to the verb 'measure' (of time).
When is the next full moon? The next full moon, 2024's "flower moon," will occur in three days on Thursday, May 23. The Old Farmer's Almanac says that the moon peaks at 9:53 a.m. For the best view ...
Humans have left over 187,400 kilograms (413,100 lb) of material on the Moon. Besides the 2019 Chang'e 4 and SLIM missions, the only artificial objects on the Moon that are still in use are the retroreflectors for the Lunar Laser Ranging experiments left there by the Apollo 11 , 14, and 15 astronauts, Chandrayaan-3 lunar lander, and by the ...