| Geyser | 1999-10-25 |
|---|---|
| Grand | 0659 E, 1811 E |
| Great Fountain | 0802 E, 1718 E |
| Values for Old Faithful Area | 1999-10-25 |
|---|---|
| Astronomical Twilight Begin | 06:13 |
| Nautical Twilight Begin | 06:47 |
| Civil Twilight Begin | 07:21 |
| Sunrise | 07:51 |
| Sunset | 18:23 |
| Civil Twilight End | 18:53 |
| Nautical Twilight End | 19:27 |
| Astronomical Twilight End | 20:00 |
| Moon Illumination | 99.8% |