单词 | secular acceleration |
释义 | secular accelerationsecular accelerationThe apparent speeding up of the Moon in its orbit around the Earth, caused by tidal friction and the gravitational attraction of other planets. It amounts to 10.3 arc seconds per century. It first became apparent from records of ancient eclipses.secular acceleration[′sek·yə·lər ak‚sel·ə′rā·shən] |
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