| Geyser | 1991-06-18 |
|---|---|
| Constant | 1610 |
| Echinus | 0955 maj, 1124, 1159, 1300, 1352, 1435, 1535 maj, 1705 |
| Emerald Spring | 1200 |
| Fireball | 1104, 1450 |
| Scummy Pool | 1200 |
| Vixen | 1631 |
| Whirligig | 1145, 1340, 1442 |
| Values for Old Faithful Area | 1991-06-18 |
|---|---|
| Astronomical Twilight Begin | 03:09 |
| Nautical Twilight Begin | 04:12 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:38 |
| Sunset | 21:10 |
| Civil Twilight End | 21:47 |
| Nautical Twilight End | 22:36 |
| Astronomical Twilight End | 23:39 |
| Moon Illumination | 40.09% |