| Geyser | 1991-10-08 |
|---|---|
| Blue | 1200 |
| Incline | 1200 |
| Values for Old Faithful Area | 1991-10-08 |
|---|---|
| Astronomical Twilight Begin | 05:52 |
| Nautical Twilight Begin | 06:26 |
| Civil Twilight Begin | 07:00 |
| Sunrise | 07:29 |
| Sunset | 18:52 |
| Civil Twilight End | 19:21 |
| Nautical Twilight End | 19:54 |
| Astronomical Twilight End | 20:28 |
| Moon Illumination | 0.15% |