planetary year
Astronomy
noun
The period of revolution of a planet round a star, especially of a planet of the solar system around the sun.
Origin
Late 19th century; earliest use found in The Century Dictionary.
| 单词 | planetary year |
| 释义 | planetary yearAstronomy noun The period of revolution of a planet round a star, especially of a planet of the solar system around the sun. Origin |
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