| Geyser | 1999-12-07 |
|---|---|
| Grand | 0356 E, 1253 E, 2335 E |
| Great Fountain | 0134 E, 1451 E |
| Values for Old Faithful Area | 1999-12-07 |
|---|---|
| Astronomical Twilight Begin | 06:00 |
| Nautical Twilight Begin | 06:36 |
| Civil Twilight Begin | 07:12 |
| Sunrise | 07:45 |
| Sunset | 16:43 |
| Civil Twilight End | 17:16 |
| Nautical Twilight End | 17:53 |
| Astronomical Twilight End | 18:28 |
| Moon Illumination | 0.39% |