| Geyser | 1991-08-09 |
|---|---|
| Echinus | 0740 ie, 0840, 0955, 1055 maj, 1255, 1327, 1425, 1515 min, 1532 |
| Morning | 1924 |
| Values for Old Faithful Area | 1991-08-09 |
|---|---|
| Astronomical Twilight Begin | 04:21 |
| Nautical Twilight Begin | 05:06 |
| Civil Twilight Begin | 05:46 |
| Sunrise | 06:19 |
| Sunset | 20:38 |
| Civil Twilight End | 21:10 |
| Nautical Twilight End | 21:50 |
| Astronomical Twilight End | 22:35 |
| Moon Illumination | 1.07% |