 |
| Subject | Chinese | English |
| tech. | 基准子午线 | reference meridian |
| tech. | 基准子午线 | Greenwich meridian |
| tech. | 心射投影基准子午线 | principal meridian of gnomonic chart |
| space | 框架标记相机框标在照片上的标记，又称 collimating marks fiducial meridian 基准子午线 | fiducial marks |
|
| Subject | Chinese | English |
| tech. | 基准子午线 | reference meridian |
| tech. | 基准子午线 | Greenwich meridian |
| tech. | 心射投影基准子午线 | principal meridian of gnomonic chart |
| space | 框架标记相机框标在照片上的标记，又称 collimating marks fiducial meridian 基准子午线 | fiducial marks |