William Rowan Hamilton Plaque
historic site
- Inscription
- Here as he walked by on the 16th of October 1843 Sir William Rowan Hamilton in a flash of genius discovered the fundamental formula for quaternion multiplication i² = j² = k² = ijk = −1 & cut it on a stone of this bridge.
| Date | Sunrise | Golden hour | Sunset |
|---|---|---|---|
| March equinox | 06:29 | 17:52 | 18:38 |
| June solstice | 04:57 | 21:00 | 21:58 |
| September equinox | 07:11 | 18:41 | 19:26 |
| December solstice | 08:39 | 15:01 | 16:09 |
Local time (Europe/Dublin).
53.37301, -6.29996
Elevation 35 m (modelled from terrain)