| Geyser | 1940-07-31 |
|---|---|
| Ledge | 0000 A |
| Values for Old Faithful Area | 1940-07-31 |
|---|---|
| Astronomical Twilight Begin | 03:05 |
| Nautical Twilight Begin | 03:53 |
| Civil Twilight Begin | 04:35 |
| Sunrise | 05:09 |
| Sunset | 19:50 |
| Civil Twilight End | 20:23 |
| Nautical Twilight End | 21:05 |
| Astronomical Twilight End | 21:53 |
| Moon Illumination | 15.31% |