| Geyser | 1976-04-18 |
|---|---|
| Beehive | 0832 |
| Beehive's Indicator | 0814 ie, 1547 ie |
| Castle | 0755 ie, 1648 ie |
| Grand | 0858 |
| Great Fountain | 1600 ie |
| Round | 0855 |
| Values for Old Faithful Area | 1976-04-18 |
|---|---|
| Astronomical Twilight Begin | 03:45 |
| Nautical Twilight Begin | 04:25 |
| Civil Twilight Begin | 05:02 |
| Sunrise | 05:33 |
| Sunset | 19:11 |
| Civil Twilight End | 19:42 |
| Nautical Twilight End | 20:19 |
| Astronomical Twilight End | 20:59 |
| Moon Illumination | 80.39% |