| Geyser | 1991-07-19 |
|---|---|
| Cistern Spring | 1200 |
| Incline | 1200 |
| Values for Old Faithful Area | 1991-07-19 |
|---|---|
| Astronomical Twilight Begin | 03:42 |
| Nautical Twilight Begin | 04:36 |
| Civil Twilight Begin | 05:21 |
| Sunrise | 05:56 |
| Sunset | 21:02 |
| Civil Twilight End | 21:37 |
| Nautical Twilight End | 22:22 |
| Astronomical Twilight End | 23:16 |
| Moon Illumination | 56.23% |