| Geyser | 1999-11-12 |
|---|---|
| Grand | 0729 E, 1729 E |
| Great Fountain | 1458 E |
| Values for Old Faithful Area | 1999-11-12 |
|---|---|
| Astronomical Twilight Begin | 05:35 |
| Nautical Twilight Begin | 06:09 |
| Civil Twilight Begin | 06:44 |
| Sunrise | 07:15 |
| Sunset | 16:59 |
| Civil Twilight End | 17:30 |
| Nautical Twilight End | 18:05 |
| Astronomical Twilight End | 18:39 |
| Moon Illumination | 14.66% |