| Geyser | 1999-03-23 |
|---|---|
| Great Fountain | 0038 E, 0938 E, 1948 E |
| Values for Old Faithful Area | 1999-03-23 |
|---|---|
| Astronomical Twilight Begin | 04:42 |
| Nautical Twilight Begin | 05:17 |
| Civil Twilight Begin | 05:51 |
| Sunrise | 06:20 |
| Sunset | 18:38 |
| Civil Twilight End | 19:07 |
| Nautical Twilight End | 19:42 |
| Astronomical Twilight End | 20:17 |
| Moon Illumination | 37.1% |