| Geyser | 1931-07-18 |
|---|---|
| Constant | 0000 |
| Valentine | 1320 |
| Values for Old Faithful Area | 1931-07-18 |
|---|---|
| Astronomical Twilight Begin | 02:39 |
| Nautical Twilight Begin | 03:34 |
| Civil Twilight Begin | 04:19 |
| Sunrise | 04:54 |
| Sunset | 20:03 |
| Civil Twilight End | 20:38 |
| Nautical Twilight End | 21:24 |
| Astronomical Twilight End | 22:19 |
| Moon Illumination | 10.32% |