| Geyser | 1999-01-06 |
|---|---|
| Great Fountain | 0203 E, 1313 E |
| Values for Old Faithful Area | 1999-01-06 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:49 |
| Civil Twilight Begin | 07:26 |
| Sunrise | 07:59 |
| Sunset | 16:58 |
| Civil Twilight End | 17:31 |
| Nautical Twilight End | 18:08 |
| Astronomical Twilight End | 18:43 |
| Moon Illumination | 80.32% |