| Geyser | 1991-06-15 |
|---|---|
| Echinus | 1100, 1120, 1225, 1330, 1413, 1450 maj |
| Occasional | 1029 |
| Values for Old Faithful Area | 1991-06-15 |
|---|---|
| Astronomical Twilight Begin | 03:10 |
| Nautical Twilight Begin | 04:12 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:37 |
| Sunset | 21:09 |
| Civil Twilight End | 21:46 |
| Nautical Twilight End | 22:34 |
| Astronomical Twilight End | 23:37 |
| Moon Illumination | 11.05% |