| Geyser | 1999-11-25 |
|---|---|
| Grand | 0808 E, 1723 E |
| Great Fountain | 0242 E, 1123 E, 2021 E |
| Values for Old Faithful Area | 1999-11-25 |
|---|---|
| Astronomical Twilight Begin | 05:49 |
| Nautical Twilight Begin | 06:24 |
| Civil Twilight Begin | 07:00 |
| Sunrise | 07:32 |
| Sunset | 16:48 |
| Civil Twilight End | 17:20 |
| Nautical Twilight End | 17:56 |
| Astronomical Twilight End | 18:31 |
| Moon Illumination | 94.08% |