| Geyser | 1971-10-31 |
|---|---|
| Old Faithful | 0842 short, 0945 |
| Values for Old Faithful Area | 1971-10-31 |
|---|---|
| Astronomical Twilight Begin | 05:20 |
| Nautical Twilight Begin | 05:54 |
| Civil Twilight Begin | 06:28 |
| Sunrise | 06:58 |
| Sunset | 17:15 |
| Civil Twilight End | 17:45 |
| Nautical Twilight End | 18:19 |
| Astronomical Twilight End | 18:53 |
| Moon Illumination | 89.79% |