| Geyser | 2000-01-23 |
|---|---|
| Grand | 0938 E, 2232 E |
| Great Fountain | 0758 E, 1819 E |
| Values for Old Faithful Area | 2000-01-23 |
|---|---|
| Astronomical Twilight Begin | 06:09 |
| Nautical Twilight Begin | 06:43 |
| Civil Twilight Begin | 07:19 |
| Sunrise | 07:50 |
| Sunset | 17:19 |
| Civil Twilight End | 17:50 |
| Nautical Twilight End | 18:26 |
| Astronomical Twilight End | 19:00 |
| Moon Illumination | 93.89% |