| Geyser | 1999-01-27 |
|---|---|
| Great Fountain | 0423 E, 1328 E, 2228 E |
| Values for Old Faithful Area | 1999-01-27 |
|---|---|
| Astronomical Twilight Begin | 06:06 |
| Nautical Twilight Begin | 06:40 |
| Civil Twilight Begin | 07:15 |
| Sunrise | 07:47 |
| Sunset | 17:25 |
| Civil Twilight End | 17:56 |
| Nautical Twilight End | 18:31 |
| Astronomical Twilight End | 19:05 |
| Moon Illumination | 77.14% |