| Geyser | 1999-11-10 |
|---|---|
| Grand | 0144 E, 1441 E |
| Great Fountain | 0450 E, 1546 E |
| Values for Old Faithful Area | 1999-11-10 |
|---|---|
| Astronomical Twilight Begin | 05:32 |
| Nautical Twilight Begin | 06:06 |
| Civil Twilight Begin | 06:41 |
| Sunrise | 07:12 |
| Sunset | 17:01 |
| Civil Twilight End | 17:32 |
| Nautical Twilight End | 18:07 |
| Astronomical Twilight End | 18:41 |
| Moon Illumination | 4.09% |