| 单词 |
lunar nutation |
| 释义 |
lunar nutation lunar nutation[′lü·nər nü′tā·shən] (astronomy) A nodding motion of the earth's axis caused by the inclination of the moon's orbit to the ecliptic; it can displace the celestial pole by 9 seconds of arc from its mean position and has a period of 18.6 years. |
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