| Geyser | 1951-07-21 |
|---|---|
| Valentine | 1200 A |
| Values for Old Faithful Area | 1951-07-21 |
|---|---|
| Astronomical Twilight Begin | 02:45 |
| Nautical Twilight Begin | 03:38 |
| Civil Twilight Begin | 04:23 |
| Sunrise | 04:57 |
| Sunset | 20:01 |
| Civil Twilight End | 20:35 |
| Nautical Twilight End | 21:20 |
| Astronomical Twilight End | 22:13 |
| Moon Illumination | 91.28% |