| Geyser | 1999-12-03 |
|---|---|
| Grand | 0256 E, 1432 E, 2332 E |
| Great Fountain | 0947 E, 2046 E |
| Veteran | 1630 |
| Values for Old Faithful Area | 1999-12-03 |
|---|---|
| Astronomical Twilight Begin | 05:57 |
| Nautical Twilight Begin | 06:32 |
| Civil Twilight Begin | 07:08 |
| Sunrise | 07:41 |
| Sunset | 16:44 |
| Civil Twilight End | 17:17 |
| Nautical Twilight End | 17:53 |
| Astronomical Twilight End | 18:28 |
| Moon Illumination | 18.72% |