| Geyser | 1999-10-18 |
|---|---|
| Arsenic | 1220 |
| Constant | 1237 |
| Grand | 1153 E, 2253 E |
| Great Fountain | 0720 E, 1630 E |
| Pinto | 1227 |
| Values for Old Faithful Area | 1999-10-18 |
|---|---|
| Astronomical Twilight Begin | 06:05 |
| Nautical Twilight Begin | 06:39 |
| Civil Twilight Begin | 07:12 |
| Sunrise | 07:42 |
| Sunset | 18:34 |
| Civil Twilight End | 19:04 |
| Nautical Twilight End | 19:37 |
| Astronomical Twilight End | 20:11 |
| Moon Illumination | 56.16% |