| Geyser | 1931-09-04 |
|---|---|
| Ebony | 1050 |
| Valentine | 1650 |
| Values for Old Faithful Area | 1931-09-04 |
|---|---|
| Astronomical Twilight Begin | 04:05 |
| Nautical Twilight Begin | 04:43 |
| Civil Twilight Begin | 05:18 |
| Sunrise | 05:48 |
| Sunset | 18:56 |
| Civil Twilight End | 19:26 |
| Nautical Twilight End | 20:01 |
| Astronomical Twilight End | 20:39 |
| Moon Illumination | 60% |