| Geyser | 1999-05-15 |
|---|---|
| Great Fountain | 0308 E, 1603 E |
| Values for Old Faithful Area | 1999-05-15 |
|---|---|
| Astronomical Twilight Begin | 03:49 |
| Nautical Twilight Begin | 04:39 |
| Civil Twilight Begin | 05:22 |
| Sunrise | 05:55 |
| Sunset | 20:43 |
| Civil Twilight End | 21:17 |
| Nautical Twilight End | 21:59 |
| Astronomical Twilight End | 22:49 |
| Moon Illumination | 0.1% |