| 单词 |
prime vertical circle |
| 释义 |
prime vertical circle prime vertical circle[′prīm ′vərd·ə·kəl ′sər·kəl] (geodesy) The vertical circle through the east and west points of the horizon. prime vertical circle The prime vertical circle cuts the observer's vertical circle at 90° and forms the east and west point of the horizon. |
| 随便看 |
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