Methods | Time | C (m/s) | C-error (m/s) | g (m/s²) |
Geodimeter | 1953 | 299,792,400 | 110 | 9.811856 |
| 1953 | 299,792,200 | 130 | 9.818074 |
| 1955 | 299,792,400 | 400 | 9.816501 |
| 1967 | 299,792,500 | 50 | 9.810565 |
| 1971 | 299,792,375 | 60 | 9.819047 |
Laser | 1972 | 299,792,460 | 6 | 9.794161 |
| 1974 | 299,792,459 | 0.8 | 9.811856 |
| 1978 | 299,792,458.8 | 0.2 | 9.811856 |
| 1979 | 299,792,458.1 | 1.9 | 9.80616 |
| 1983 | 299,792,458.6 | 0.3 | 9.800849 |