| Geyser | 1991-07-16 |
|---|---|
| Echinus | 0945, 1033, 1123 maj, 1300, 1536 maj |
| Fearless | 1200 |
| Palpitator Spring | 1200 |
| Pearl | 1200 |
| Vixen | 1200 |
| Whirligig | 0935, 1130, 1207 |
| Values for Old Faithful Area | 1991-07-16 |
|---|---|
| Astronomical Twilight Begin | 03:37 |
| Nautical Twilight Begin | 04:32 |
| Civil Twilight Begin | 05:18 |
| Sunrise | 05:53 |
| Sunset | 21:05 |
| Civil Twilight End | 21:40 |
| Nautical Twilight End | 22:25 |
| Astronomical Twilight End | 23:21 |
| Moon Illumination | 25.73% |