| Geyser | 1959-10-17 |
|---|---|
| Sapphire Pool | 0600-2100 |
| Values for Old Faithful Area | 1959-10-17 |
|---|---|
| Astronomical Twilight Begin | 05:03 |
| Nautical Twilight Begin | 05:37 |
| Civil Twilight Begin | 06:11 |
| Sunrise | 06:40 |
| Sunset | 17:37 |
| Civil Twilight End | 18:06 |
| Nautical Twilight End | 18:40 |
| Astronomical Twilight End | 19:13 |
| Moon Illumination | 99.61% |