| Geyser | 1976-04-15 |
|---|---|
| Great Fountain | 0628, 1500 ie, 2231 |
| Pink Cone | 1716 ie |
| Surprise Pool | 1617, 1650 |
| White Dome | 1527, 1613, 1630, 1711, 1743 min |
| Values for Old Faithful Area | 1976-04-15 |
|---|---|
| Astronomical Twilight Begin | 03:51 |
| Nautical Twilight Begin | 04:31 |
| Civil Twilight Begin | 05:08 |
| Sunrise | 05:38 |
| Sunset | 19:08 |
| Civil Twilight End | 19:38 |
| Nautical Twilight End | 20:15 |
| Astronomical Twilight End | 20:54 |
| Moon Illumination | 99.03% |