| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Effective Earth's radius | Geography | The radius of an ideal spherical Earth without atmosphere for which propagation paths are along straight lines, the height and ground distances being the same as for the actual Earth in an atmosphere with a constant vertical gradient of refractivity. Source: European Union. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
