| Geyser | 1931-06-17 |
|---|---|
| Ebony | 1525 |
| Values for Old Faithful Area | 1931-06-17 |
|---|---|
| Astronomical Twilight Begin | 02:09 |
| Nautical Twilight Begin | 03:12 |
| Civil Twilight Begin | 04:01 |
| Sunrise | 04:37 |
| Sunset | 20:10 |
| Civil Twilight End | 20:46 |
| Nautical Twilight End | 21:35 |
| Astronomical Twilight End | 22:38 |
| Moon Illumination | 1.66% |