| Clue | Source | Date |
|---|---|---|
| More than one surveyor goes wrong – stop to intervene | ||
| Experts in determining the exact shape and size of the earth | New York Times | 20 Nov 2020 |
| George stops flat-earther's nemeses? | ||
| Scientists who measure the exact shape and size of Earth | New York Times | 11 Aug 2018 |
| Scientists who measure the exact shape and size of Earth |