| Geyser | 1999-01-15 |
|---|---|
| Great Fountain | 0903 E, 2013 E |
| Values for Old Faithful Area | 1999-01-15 |
|---|---|
| Astronomical Twilight Begin | 06:13 |
| Nautical Twilight Begin | 06:47 |
| Civil Twilight Begin | 07:23 |
| Sunrise | 07:56 |
| Sunset | 17:09 |
| Civil Twilight End | 17:41 |
| Nautical Twilight End | 18:17 |
| Astronomical Twilight End | 18:52 |
| Moon Illumination | 5.76% |