| Geyser | 1991-05-10 |
|---|---|
| Echinus | 1306 |
| Values for Old Faithful Area | 1991-05-10 |
|---|---|
| Astronomical Twilight Begin | 03:59 |
| Nautical Twilight Begin | 04:47 |
| Civil Twilight Begin | 05:28 |
| Sunrise | 06:01 |
| Sunset | 20:37 |
| Civil Twilight End | 21:10 |
| Nautical Twilight End | 21:52 |
| Astronomical Twilight End | 22:39 |
| Moon Illumination | 19.41% |