| Geyser | 1999-02-11 |
|---|---|
| Great Fountain | 0243 E, 1418 E |
| Values for Old Faithful Area | 1999-02-11 |
|---|---|
| Astronomical Twilight Begin | 05:50 |
| Nautical Twilight Begin | 06:24 |
| Civil Twilight Begin | 06:58 |
| Sunrise | 07:29 |
| Sunset | 17:46 |
| Civil Twilight End | 18:16 |
| Nautical Twilight End | 18:50 |
| Astronomical Twilight End | 19:24 |
| Moon Illumination | 24.67% |