| Geyser | 1999-04-03 |
|---|---|
| Great Fountain | 0758 E, 1758 E |
| Values for Old Faithful Area | 1999-04-03 |
|---|---|
| Astronomical Twilight Begin | 04:19 |
| Nautical Twilight Begin | 04:56 |
| Civil Twilight Begin | 05:31 |
| Sunrise | 06:00 |
| Sunset | 18:52 |
| Civil Twilight End | 19:22 |
| Nautical Twilight End | 19:57 |
| Astronomical Twilight End | 20:33 |
| Moon Illumination | 94.89% |