| Geyser | 1999-11-16 |
|---|---|
| Grand | 0317 E, 1426 E |
| Great Fountain | 0030 E, 1104 E, 2138 E |
| Values for Old Faithful Area | 1999-11-16 |
|---|---|
| Astronomical Twilight Begin | 05:39 |
| Nautical Twilight Begin | 06:14 |
| Civil Twilight Begin | 06:49 |
| Sunrise | 07:20 |
| Sunset | 16:55 |
| Civil Twilight End | 17:26 |
| Nautical Twilight End | 18:02 |
| Astronomical Twilight End | 18:36 |
| Moon Illumination | 49.33% |