| Geyser | 1931-07-25 |
|---|---|
| Ebony | 1515 |
| Valentine | 0615 |
| Values for Old Faithful Area | 1931-07-25 |
|---|---|
| Astronomical Twilight Begin | 02:52 |
| Nautical Twilight Begin | 03:43 |
| Civil Twilight Begin | 04:27 |
| Sunrise | 05:01 |
| Sunset | 19:57 |
| Civil Twilight End | 20:31 |
| Nautical Twilight End | 21:15 |
| Astronomical Twilight End | 22:06 |
| Moon Illumination | 81.54% |