| Geyser | 1999-02-09 |
|---|---|
| Great Fountain | 0903 E, 1943 E |
| Values for Old Faithful Area | 1999-02-09 |
|---|---|
| Astronomical Twilight Begin | 05:53 |
| Nautical Twilight Begin | 06:27 |
| Civil Twilight Begin | 07:01 |
| Sunrise | 07:31 |
| Sunset | 17:43 |
| Civil Twilight End | 18:13 |
| Nautical Twilight End | 18:47 |
| Astronomical Twilight End | 19:21 |
| Moon Illumination | 42.6% |