| Geyser | 1991-05-05 |
|---|---|
| Morning | 0025 |
| Values for Old Faithful Area | 1991-05-05 |
|---|---|
| Astronomical Twilight Begin | 04:09 |
| Nautical Twilight Begin | 04:55 |
| Civil Twilight Begin | 05:35 |
| Sunrise | 06:08 |
| Sunset | 20:31 |
| Civil Twilight End | 21:04 |
| Nautical Twilight End | 21:44 |
| Astronomical Twilight End | 22:30 |
| Moon Illumination | 66.74% |