| Geyser | 1999-12-14 |
|---|---|
| Grand | 0626 E, 1856 E |
| Great Fountain | 0603 E, 1731 E |
| Values for Old Faithful Area | 1999-12-14 |
|---|---|
| Astronomical Twilight Begin | 06:06 |
| Nautical Twilight Begin | 06:41 |
| Civil Twilight Begin | 07:18 |
| Sunrise | 07:51 |
| Sunset | 16:44 |
| Civil Twilight End | 17:17 |
| Nautical Twilight End | 17:54 |
| Astronomical Twilight End | 18:29 |
| Moon Illumination | 32.74% |