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questionedithistorytranslations
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flag English language

What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?
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Moon's libration changes the angle from which the Moon is seen, allowing about 59% of its surface to be seen from the Earth (but only half at any instant). Moon's libration is caused by the eccentricity of its orbit around Earth and by a slight inclination of its axis of rotation.
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flag Polish language

Jaka część powierzchni Księżyca znana była ludzkości, zanim dokonano pierwszych zdjęć ciemnej strony w roku 1959?
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Księżyc zwrócony jest stale tą samą stroną do Ziemi, ale ze względu na librację można zobaczyć aż do 59% procent jego powiedzchni - takie mapy Księżyca istniały już w renesansie. Libracja to efekt tego, że orbita Księżyca nie jest idealnym okręgiem, a jego własna oś obrotu jest lekko przekrzywiona.
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