| Geyser | 1999-10-16 |
|---|---|
| Grand | 0744 E, 1926 E |
| Great Fountain | 0746 E, 1706 E |
| Values for Old Faithful Area | 1999-10-16 |
|---|---|
| Astronomical Twilight Begin | 06:02 |
| Nautical Twilight Begin | 06:36 |
| Civil Twilight Begin | 07:10 |
| Sunrise | 07:39 |
| Sunset | 18:38 |
| Civil Twilight End | 19:07 |
| Nautical Twilight End | 19:41 |
| Astronomical Twilight End | 20:14 |
| Moon Illumination | 37.08% |