| Geyser | 1931-06-30 |
|---|---|
| Ebony | 1205 |
| Valentine | 1515 |
| Values for Old Faithful Area | 1931-06-30 |
|---|---|
| Astronomical Twilight Begin | 02:14 |
| Nautical Twilight Begin | 03:16 |
| Civil Twilight Begin | 04:04 |
| Sunrise | 04:41 |
| Sunset | 20:11 |
| Civil Twilight End | 20:48 |
| Nautical Twilight End | 21:36 |
| Astronomical Twilight End | 22:39 |
| Moon Illumination | 99.92% |