| Geyser | 1999-10-29 |
|---|---|
| Grand | 0514 E, 1653 E |
| Great Fountain | 0102 E, 1054 E, 2216 E |
| Values for Old Faithful Area | 1999-10-29 |
|---|---|
| Astronomical Twilight Begin | 06:18 |
| Nautical Twilight Begin | 06:52 |
| Civil Twilight Begin | 07:26 |
| Sunrise | 07:56 |
| Sunset | 18:17 |
| Civil Twilight End | 18:47 |
| Nautical Twilight End | 19:21 |
| Astronomical Twilight End | 19:55 |
| Moon Illumination | 74.73% |