| Geyser | 1999-01-03 |
|---|---|
| Great Fountain | 0838 E, 1913 E |
| Values for Old Faithful Area | 1999-01-03 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:49 |
| Civil Twilight Begin | 07:26 |
| Sunrise | 07:59 |
| Sunset | 16:55 |
| Civil Twilight End | 17:29 |
| Nautical Twilight End | 18:05 |
| Astronomical Twilight End | 18:40 |
| Moon Illumination | 98.2% |