| Geyser | 1991-09-05 |
|---|---|
| Echinus | 0925, 1026 |
| Values for Old Faithful Area | 1991-09-05 |
|---|---|
| Astronomical Twilight Begin | 05:07 |
| Nautical Twilight Begin | 05:45 |
| Civil Twilight Begin | 06:20 |
| Sunrise | 06:50 |
| Sunset | 19:53 |
| Civil Twilight End | 20:23 |
| Nautical Twilight End | 20:58 |
| Astronomical Twilight End | 21:36 |
| Moon Illumination | 13.8% |