| Geyser | 1991-07-18 |
|---|---|
| Echinus | 1349, 1447 |
| Whistle | 0000-2359, 2100 ns maj |
| Values for Old Faithful Area | 1991-07-18 |
|---|---|
| Astronomical Twilight Begin | 03:40 |
| Nautical Twilight Begin | 04:35 |
| Civil Twilight Begin | 05:20 |
| Sunrise | 05:55 |
| Sunset | 21:03 |
| Civil Twilight End | 21:38 |
| Nautical Twilight End | 22:23 |
| Astronomical Twilight End | 23:18 |
| Moon Illumination | 46.07% |