| Geyser | 1991-08-18 |
|---|---|
| Blue | 1200 |
| Echinus | 0921, 1030, 1130, 1240, 1331 maj, 1515, 1530 |
| Morning | 0425, 0819, 1200, 1551, 1953, 2351 |
| Values for Old Faithful Area | 1991-08-18 |
|---|---|
| Astronomical Twilight Begin | 04:38 |
| Nautical Twilight Begin | 05:19 |
| Civil Twilight Begin | 05:58 |
| Sunrise | 06:29 |
| Sunset | 20:24 |
| Civil Twilight End | 20:56 |
| Nautical Twilight End | 21:34 |
| Astronomical Twilight End | 22:16 |
| Moon Illumination | 59.97% |