| Geyser | 1999-02-22 |
|---|---|
| Great Fountain | 0538 E, 1558 E |
| Values for Old Faithful Area | 1999-02-22 |
|---|---|
| Astronomical Twilight Begin | 05:35 |
| Nautical Twilight Begin | 06:09 |
| Civil Twilight Begin | 06:42 |
| Sunrise | 07:12 |
| Sunset | 18:01 |
| Civil Twilight End | 18:30 |
| Nautical Twilight End | 19:04 |
| Astronomical Twilight End | 19:38 |
| Moon Illumination | 40.61% |