| Geyser | 1999-11-15 |
|---|---|
| Grand | 0459 E, 1535 E |
| Great Fountain | 0342 E, 1403 E |
| Values for Old Faithful Area | 1999-11-15 |
|---|---|
| Astronomical Twilight Begin | 05:38 |
| Nautical Twilight Begin | 06:12 |
| Civil Twilight Begin | 06:48 |
| Sunrise | 07:19 |
| Sunset | 16:56 |
| Civil Twilight End | 17:27 |
| Nautical Twilight End | 18:02 |
| Astronomical Twilight End | 18:37 |
| Moon Illumination | 39.53% |