| Geyser | 1999-11-28 |
|---|---|
| Giant | 1529 |
| Grand | 0729 E, 2017 E |
| Great Fountain | 0928 E, 1910 E |
| Values for Old Faithful Area | 1999-11-28 |
|---|---|
| Astronomical Twilight Begin | 05:52 |
| Nautical Twilight Begin | 06:27 |
| Civil Twilight Begin | 07:03 |
| Sunrise | 07:35 |
| Sunset | 16:46 |
| Civil Twilight End | 17:19 |
| Nautical Twilight End | 17:55 |
| Astronomical Twilight End | 18:29 |
| Moon Illumination | 68.11% |