| Geyser | 1999-10-30 |
|---|---|
| Grand | 0526 E, 1332 E |
| Great Fountain | 0723 E, 1608 E |
| Values for Old Faithful Area | 1999-10-30 |
|---|---|
| Astronomical Twilight Begin | 06:19 |
| Nautical Twilight Begin | 06:53 |
| Civil Twilight Begin | 07:27 |
| Sunrise | 07:57 |
| Sunset | 18:16 |
| Civil Twilight End | 18:46 |
| Nautical Twilight End | 19:20 |
| Astronomical Twilight End | 19:54 |
| Moon Illumination | 64.09% |