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视宁度[Seeing] [2005-10-25]
iamet 发表在 ¤〖天文〗
| | Seeing is a term used to express the effects of the atmosphere on telescopic observation. For example, seeing is often good in the southwest United States since there are many nights during the year when the humidity and cloudiness are low and the skies are very clear. |
学好数理化，走遍天下都不怕！ | |
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