| Geyser | 1999-02-20 |
|---|---|
| Great Fountain | 0018 E, 1103 E, 2128 E |
| Values for Old Faithful Area | 1999-02-20 |
|---|---|
| Astronomical Twilight Begin | 05:38 |
| Nautical Twilight Begin | 06:12 |
| Civil Twilight Begin | 06:46 |
| Sunrise | 07:15 |
| Sunset | 17:58 |
| Civil Twilight End | 18:28 |
| Nautical Twilight End | 19:01 |
| Astronomical Twilight End | 19:35 |
| Moon Illumination | 19.69% |