| Geyser | 1999-10-14 |
|---|---|
| Grand | 1047 E, 2041 E |
| Great Fountain | 0518 E, 1614 E |
| Values for Old Faithful Area | 1999-10-14 |
|---|---|
| Astronomical Twilight Begin | 06:00 |
| Nautical Twilight Begin | 06:34 |
| Civil Twilight Begin | 07:07 |
| Sunrise | 07:37 |
| Sunset | 18:41 |
| Civil Twilight End | 19:10 |
| Nautical Twilight End | 19:44 |
| Astronomical Twilight End | 20:18 |
| Moon Illumination | 20.15% |