| Geyser | 1999-01-08 |
|---|---|
| Great Fountain | 1018 E, 2033 E |
| Values for Old Faithful Area | 1999-01-08 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:49 |
| Civil Twilight Begin | 07:26 |
| Sunrise | 07:58 |
| Sunset | 17:01 |
| Civil Twilight End | 17:33 |
| Nautical Twilight End | 18:10 |
| Astronomical Twilight End | 18:45 |
| Moon Illumination | 62.48% |