| Geyser | 1991-09-01 |
|---|---|
| Constant | 1120, 1408 |
| Crater Spring | 1200 |
| Echinus | 0840 maj, 1030, 1110, 1200, 1223, 1315 maj, 1450 |
| Values for Old Faithful Area | 1991-09-01 |
|---|---|
| Astronomical Twilight Begin | 05:01 |
| Nautical Twilight Begin | 05:39 |
| Civil Twilight Begin | 06:15 |
| Sunrise | 06:45 |
| Sunset | 20:00 |
| Civil Twilight End | 20:30 |
| Nautical Twilight End | 21:06 |
| Astronomical Twilight End | 21:45 |
| Moon Illumination | 55.88% |