| Geyser | 1976-04-28 |
|---|---|
| Beehive | 1304 |
| Castle | 0851 ie, 1751 |
| Grand | 1919 ie |
| Great Fountain | 1831 |
| Values for Old Faithful Area | 1976-04-28 |
|---|---|
| Astronomical Twilight Begin | 04:23 |
| Nautical Twilight Begin | 05:06 |
| Civil Twilight Begin | 05:45 |
| Sunrise | 06:17 |
| Sunset | 20:24 |
| Civil Twilight End | 20:55 |
| Nautical Twilight End | 21:34 |
| Astronomical Twilight End | 22:17 |
| Moon Illumination | 1.27% |