|
Prime meridians |
Ancient Astronomical Prime Meridians |
| Location | Longitude | Time offset | Ref. |
| Babylon | 79º | +1h 14m | V 20.6 |
| Jerusalem (Hierosolyma) | 66º | +0h 22m | V 16.8 |
| Alexandria | 60;30º | +0h 00m | IV 5.9 |
| Constantinople (Byzantium) | 56º | –0h 18m | III 11.5 |
| Athens | 52;45º | –0h 31m | III 15.22 |
| Rome | 36;40º | –1h 35m | III 1.61 |