| Geyser | 1981-09-22 |
|---|---|
| Blue | 1200 |
| Dark Cavern | 1200 |
| Fearless | 1200 |
| Values for Old Faithful Area | 1981-09-22 |
|---|---|
| Astronomical Twilight Begin | 05:32 |
| Nautical Twilight Begin | 06:07 |
| Civil Twilight Begin | 06:41 |
| Sunrise | 07:10 |
| Sunset | 19:21 |
| Civil Twilight End | 19:50 |
| Nautical Twilight End | 20:24 |
| Astronomical Twilight End | 20:59 |
| Moon Illumination | 34.45% |