| Geyser | 1999-05-19 |
|---|---|
| Great Fountain | 0518 E, 1343 E |
| Values for Old Faithful Area | 1999-05-19 |
|---|---|
| Astronomical Twilight Begin | 03:42 |
| Nautical Twilight Begin | 04:33 |
| Civil Twilight Begin | 05:17 |
| Sunrise | 05:51 |
| Sunset | 20:47 |
| Civil Twilight End | 21:22 |
| Nautical Twilight End | 22:05 |
| Astronomical Twilight End | 22:57 |
| Moon Illumination | 19.45% |