| Geyser | 1999-03-17 |
|---|---|
| Great Fountain | 0918 E, 1823 E |
| Values for Old Faithful Area | 1999-03-17 |
|---|---|
| Astronomical Twilight Begin | 04:54 |
| Nautical Twilight Begin | 05:29 |
| Civil Twilight Begin | 06:03 |
| Sunrise | 06:31 |
| Sunset | 18:31 |
| Civil Twilight End | 19:00 |
| Nautical Twilight End | 19:34 |
| Astronomical Twilight End | 20:08 |
| Moon Illumination | 0.33% |