| Geyser | 1981-09-05 |
|---|---|
| Fan and Mortar | 1715 |
| Grand | 1425 |
| Values for Old Faithful Area | 1981-09-05 |
|---|---|
| Astronomical Twilight Begin | 05:08 |
| Nautical Twilight Begin | 05:45 |
| Civil Twilight Begin | 06:21 |
| Sunrise | 06:50 |
| Sunset | 19:52 |
| Civil Twilight End | 20:22 |
| Nautical Twilight End | 20:58 |
| Astronomical Twilight End | 21:35 |
| Moon Illumination | 37.72% |