| Geyser | 1991-08-28 |
|---|---|
| Constant | 1236, 1525 |
| Echinus | 0925, 1035, 1132, 1234, 1338, 1440, 1545 maj |
| Fireball | 1311 |
| Morning | 0011 E, 0355 E, 0745, 1138, 1853 |
| Whirligig | 1244, 1505 |
| Values for Old Faithful Area | 1991-08-28 |
|---|---|
| Astronomical Twilight Begin | 04:55 |
| Nautical Twilight Begin | 05:34 |
| Civil Twilight Begin | 06:10 |
| Sunrise | 06:41 |
| Sunset | 20:08 |
| Civil Twilight End | 20:38 |
| Nautical Twilight End | 21:14 |
| Astronomical Twilight End | 21:53 |
| Moon Illumination | 91.63% |