| Geyser | 1999-03-20 |
|---|---|
| Great Fountain | 1003 E, 1853 E |
| Values for Old Faithful Area | 1999-03-20 |
|---|---|
| Astronomical Twilight Begin | 04:48 |
| Nautical Twilight Begin | 05:23 |
| Civil Twilight Begin | 05:57 |
| Sunrise | 06:26 |
| Sunset | 18:35 |
| Civil Twilight End | 19:04 |
| Nautical Twilight End | 19:38 |
| Astronomical Twilight End | 20:13 |
| Moon Illumination | 8.79% |