| Geyser | 1999-11-13 |
|---|---|
| Grand | 0611 E, 1647 E |
| Great Fountain | 0002 E, 1054 E, 2248 E |
| Values for Old Faithful Area | 1999-11-13 |
|---|---|
| Astronomical Twilight Begin | 05:36 |
| Nautical Twilight Begin | 06:10 |
| Civil Twilight Begin | 06:45 |
| Sunrise | 07:16 |
| Sunset | 16:58 |
| Civil Twilight End | 17:29 |
| Nautical Twilight End | 18:04 |
| Astronomical Twilight End | 18:38 |
| Moon Illumination | 21.96% |