| Geyser | 1991-07-13 |
|---|---|
| Echinus | 0945, 1040, 1135, 1230, 1315 maj, 1500, 1525 maj |
| Ledge Spring | 1430 |
| Values for Old Faithful Area | 1991-07-13 |
|---|---|
| Astronomical Twilight Begin | 03:32 |
| Nautical Twilight Begin | 04:29 |
| Civil Twilight Begin | 05:15 |
| Sunrise | 05:50 |
| Sunset | 21:07 |
| Civil Twilight End | 21:42 |
| Nautical Twilight End | 22:28 |
| Astronomical Twilight End | 23:25 |
| Moon Illumination | 3.22% |