| Geyser | 1999-04-02 |
|---|---|
| Great Fountain | 0633 E, 1558 E |
| Values for Old Faithful Area | 1999-04-02 |
|---|---|
| Astronomical Twilight Begin | 04:21 |
| Nautical Twilight Begin | 04:58 |
| Civil Twilight Begin | 05:33 |
| Sunrise | 06:02 |
| Sunset | 18:51 |
| Civil Twilight End | 19:20 |
| Nautical Twilight End | 19:55 |
| Astronomical Twilight End | 20:32 |
| Moon Illumination | 98.27% |