 |
| |||
| midheaven | |||
| longitude circle; meridian circle | |||
| meridian; observer's meridian; principal vertical circle; transit meridian; longitude line | |||
| 子午圈: 50 phrases in 10 subjects |
| Agriculture | 1 |
| Astronomy | 1 |
| Aviation | 3 |
| Drilling | 1 |
| Earth sciences | 2 |
| Electronics | 1 |
| General | 2 |
| Oil / petroleum | 3 |
| Space | 6 |
| Technology | 30 |