| Geyser | 1999-01-26 |
|---|---|
| Great Fountain | 0338 E, 1403 E |
| Values for Old Faithful Area | 1999-01-26 |
|---|---|
| Astronomical Twilight Begin | 06:07 |
| Nautical Twilight Begin | 06:41 |
| Civil Twilight Begin | 07:16 |
| Sunrise | 07:48 |
| Sunset | 17:23 |
| Civil Twilight End | 17:55 |
| Nautical Twilight End | 18:30 |
| Astronomical Twilight End | 19:04 |
| Moon Illumination | 66.83% |