| Geyser | 1999-03-18 |
|---|---|
| Great Fountain | 0608 E, 1623 E |
| Values for Old Faithful Area | 1999-03-18 |
|---|---|
| Astronomical Twilight Begin | 04:52 |
| Nautical Twilight Begin | 05:27 |
| Civil Twilight Begin | 06:01 |
| Sunrise | 06:30 |
| Sunset | 18:32 |
| Civil Twilight End | 19:01 |
| Nautical Twilight End | 19:35 |
| Astronomical Twilight End | 20:10 |
| Moon Illumination | 0.37% |