| Geyser | 1991-02-21 |
|---|---|
| Fan and Mortar | 1200 A |
| Values for Old Faithful Area | 1991-02-21 |
|---|---|
| Astronomical Twilight Begin | 05:37 |
| Nautical Twilight Begin | 06:10 |
| Civil Twilight Begin | 06:44 |
| Sunrise | 07:14 |
| Sunset | 17:59 |
| Civil Twilight End | 18:29 |
| Nautical Twilight End | 19:03 |
| Astronomical Twilight End | 19:36 |
| Moon Illumination | 42.45% |