| Geyser | 1999-01-28 |
|---|---|
| Great Fountain | 1028 E, 2128 E |
| Values for Old Faithful Area | 1999-01-28 |
|---|---|
| Astronomical Twilight Begin | 06:05 |
| Nautical Twilight Begin | 06:39 |
| Civil Twilight Begin | 07:14 |
| Sunrise | 07:46 |
| Sunset | 17:26 |
| Civil Twilight End | 17:57 |
| Nautical Twilight End | 18:32 |
| Astronomical Twilight End | 19:07 |
| Moon Illumination | 86.03% |