| Geyser | 1999-11-18 |
|---|---|
| Grand | 0314 E, 1717 E |
| Great Fountain | 0515 E, 1445 E |
| Values for Old Faithful Area | 1999-11-18 |
|---|---|
| Astronomical Twilight Begin | 05:41 |
| Nautical Twilight Begin | 06:16 |
| Civil Twilight Begin | 06:51 |
| Sunrise | 07:23 |
| Sunset | 16:53 |
| Civil Twilight End | 17:25 |
| Nautical Twilight End | 18:00 |
| Astronomical Twilight End | 18:35 |
| Moon Illumination | 69.46% |