| Geyser | 1999-12-02 |
|---|---|
| Grand | 0317 E, 1423 E |
| Great Fountain | 0358 E, 1214 E, 2037 E |
| Values for Old Faithful Area | 1999-12-02 |
|---|---|
| Astronomical Twilight Begin | 05:56 |
| Nautical Twilight Begin | 06:31 |
| Civil Twilight Begin | 07:07 |
| Sunrise | 07:40 |
| Sunset | 16:44 |
| Civil Twilight End | 17:17 |
| Nautical Twilight End | 17:53 |
| Astronomical Twilight End | 18:28 |
| Moon Illumination | 27.04% |