| Geyser | 1999-11-19 |
|---|---|
| Grand | 0514 E, 1602 E |
| Great Fountain | 0021 E, 0941 E, 1845 E |
| Values for Old Faithful Area | 1999-11-19 |
|---|---|
| Astronomical Twilight Begin | 05:42 |
| Nautical Twilight Begin | 06:17 |
| Civil Twilight Begin | 06:52 |
| Sunrise | 07:24 |
| Sunset | 16:52 |
| Civil Twilight End | 17:24 |
| Nautical Twilight End | 17:59 |
| Astronomical Twilight End | 18:34 |
| Moon Illumination | 78.96% |