| Geyser | 1991-09-04 |
|---|---|
| Constant | 0844, 1246 |
| Echinus | 0830 maj, 1100 maj, 1300, 1355 |
| Rubble | 1200 |
| Steamboat | 1200 |
| Vixen | 1200 |
| Whirligig | 1014, 1127 |
| Values for Old Faithful Area | 1991-09-04 |
|---|---|
| Astronomical Twilight Begin | 05:06 |
| Nautical Twilight Begin | 05:43 |
| Civil Twilight Begin | 06:19 |
| Sunrise | 06:49 |
| Sunset | 19:55 |
| Civil Twilight End | 20:25 |
| Nautical Twilight End | 21:00 |
| Astronomical Twilight End | 21:38 |
| Moon Illumination | 22.91% |