海王星Neptune的发现
After the planet Uranus had been discovered, a Cambridge mathematician, Adams, predicted the existence of an unseen planet, to account for the fact that Uranus was being pulled slightly out of position in its orbit. According to Isaac Newtons theory of gravitation, Adams attributed this pull to the gravitational effect of an unknown body, and calculated its position. One year later , this new planet, Neptune, was discovered, and its position was quite in accordance with the prediction.
From the fact that planet Uranus was a bit pulled out of its normal orbit, some mathematicians logically reasoned the existence of a new planet, Neptune, and even precisely calculated its position according to Newtons theory of universal gravitation in 1845. One year later Neptune was discovered just around the predicted position.
哈雷彗星的发现
After thoroughly comparing several comet observation records, Halley eventually found the similarities of the periods of some records. He further induced that these records actually refer to a unique comet, Halley comet, and predicted that the comet would appear again after another period of 76 years.
after several years careful observation and thorough calculation, Halley predicted that the comet appeared in 1682 was periodic and it would return after 76 years in 1758. Halley passed away fifteen years ago before his prediction was confirmed.
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