| Geyser | 1999-02-08 |
|---|---|
| Great Fountain | 1148 E, 2123 E |
| Values for Old Faithful Area | 1999-02-08 |
|---|---|
| Astronomical Twilight Begin | 05:54 |
| Nautical Twilight Begin | 06:28 |
| Civil Twilight Begin | 07:02 |
| Sunrise | 07:33 |
| Sunset | 17:41 |
| Civil Twilight End | 18:12 |
| Nautical Twilight End | 18:46 |
| Astronomical Twilight End | 19:20 |
| Moon Illumination | 52% |