| Geyser | 1991-08-12 |
|---|---|
| Cistern Spring | 1200 |
| Crater Spring | 1200 |
| Echinus | 1010 maj, 1205, 1257, 1359, 1500, 1558 maj |
| Morning | 0553, 0923, 1302, 1654, 2039 |
| Yellow Funnel Spring | 1200 |
| Values for Old Faithful Area | 1991-08-12 |
|---|---|
| Astronomical Twilight Begin | 04:27 |
| Nautical Twilight Begin | 05:11 |
| Civil Twilight Begin | 05:50 |
| Sunrise | 06:22 |
| Sunset | 20:34 |
| Civil Twilight End | 21:06 |
| Nautical Twilight End | 21:45 |
| Astronomical Twilight End | 22:29 |
| Moon Illumination | 6.5% |