| Geyser | 1999-11-30 |
|---|---|
| Grand | 0423 E, 1620 E |
| Great Fountain | 0258 E, 1256 E, 2323 E |
| Values for Old Faithful Area | 1999-11-30 |
|---|---|
| Astronomical Twilight Begin | 05:54 |
| Nautical Twilight Begin | 06:29 |
| Civil Twilight Begin | 07:05 |
| Sunrise | 07:38 |
| Sunset | 16:45 |
| Civil Twilight End | 17:18 |
| Nautical Twilight End | 17:54 |
| Astronomical Twilight End | 18:29 |
| Moon Illumination | 46.72% |