| Geyser | 1999-11-01 |
|---|---|
| Grand | 0014 E, 1053 E, 2026 E |
| Great Fountain | 0928 E, 1910 E |
| Values for Old Faithful Area | 1999-11-01 |
|---|---|
| Astronomical Twilight Begin | 05:22 |
| Nautical Twilight Begin | 05:56 |
| Civil Twilight Begin | 06:30 |
| Sunrise | 07:00 |
| Sunset | 17:13 |
| Civil Twilight End | 17:43 |
| Nautical Twilight End | 18:17 |
| Astronomical Twilight End | 18:51 |
| Moon Illumination | 41.54% |