| Geyser | 1999-01-07 |
|---|---|
| Great Fountain | 0128 E, 0933 E, 2303 E |
| Values for Old Faithful Area | 1999-01-07 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:49 |
| Civil Twilight Begin | 07:26 |
| Sunrise | 07:59 |
| Sunset | 17:00 |
| Civil Twilight End | 17:32 |
| Nautical Twilight End | 18:09 |
| Astronomical Twilight End | 18:44 |
| Moon Illumination | 71.71% |