| Geyser | 1999-11-20 |
|---|---|
| Grand | 0429 E, 1535 E |
| Great Fountain | 0525 E, 1702 E |
| Values for Old Faithful Area | 1999-11-20 |
|---|---|
| Astronomical Twilight Begin | 05:44 |
| Nautical Twilight Begin | 06:18 |
| Civil Twilight Begin | 06:54 |
| Sunrise | 07:25 |
| Sunset | 16:51 |
| Civil Twilight End | 17:23 |
| Nautical Twilight End | 17:59 |
| Astronomical Twilight End | 18:33 |
| Moon Illumination | 87.37% |