| Geyser | 1981-05-25 |
|---|---|
| Giantess | 1930 |
| Values for Old Faithful Area | 1981-05-25 |
|---|---|
| Astronomical Twilight Begin | 03:31 |
| Nautical Twilight Begin | 04:25 |
| Civil Twilight Begin | 05:10 |
| Sunrise | 05:45 |
| Sunset | 20:54 |
| Civil Twilight End | 21:29 |
| Nautical Twilight End | 22:14 |
| Astronomical Twilight End | 23:09 |
| Moon Illumination | 66.81% |