| Geyser | 1999-11-17 |
|---|---|
| Grand | 0332 E, 1408 E |
| Great Fountain | 0730 E, 1618 E |
| Values for Old Faithful Area | 1999-11-17 |
|---|---|
| Astronomical Twilight Begin | 05:40 |
| Nautical Twilight Begin | 06:15 |
| Civil Twilight Begin | 06:50 |
| Sunrise | 07:22 |
| Sunset | 16:54 |
| Civil Twilight End | 17:26 |
| Nautical Twilight End | 18:01 |
| Astronomical Twilight End | 18:35 |
| Moon Illumination | 59.43% |