| Geyser | 1991-07-26 |
|---|---|
| Echinus | 0820, 0940, 1035, 1130, 1220, 1315, 1449, 1535 |
| Vixen | 1540 |
| Whirligig | 0845, 1330 |
| Values for Old Faithful Area | 1991-07-26 |
|---|---|
| Astronomical Twilight Begin | 03:55 |
| Nautical Twilight Begin | 04:46 |
| Civil Twilight Begin | 05:29 |
| Sunrise | 06:03 |
| Sunset | 20:56 |
| Civil Twilight End | 21:30 |
| Nautical Twilight End | 22:13 |
| Astronomical Twilight End | 23:04 |
| Moon Illumination | 99.76% |