| Geyser | 1999-01-19 |
|---|---|
| Great Fountain | 0328 E, 1453 E |
| Values for Old Faithful Area | 1999-01-19 |
|---|---|
| Astronomical Twilight Begin | 06:11 |
| Nautical Twilight Begin | 06:46 |
| Civil Twilight Begin | 07:21 |
| Sunrise | 07:53 |
| Sunset | 17:14 |
| Civil Twilight End | 17:46 |
| Nautical Twilight End | 18:22 |
| Astronomical Twilight End | 18:56 |
| Moon Illumination | 2.91% |