| Geyser | 1999-02-01 |
|---|---|
| Great Fountain | 1243 E |
| Values for Old Faithful Area | 1999-02-01 |
|---|---|
| Astronomical Twilight Begin | 06:01 |
| Nautical Twilight Begin | 06:36 |
| Civil Twilight Begin | 07:10 |
| Sunrise | 07:41 |
| Sunset | 17:32 |
| Civil Twilight End | 18:02 |
| Nautical Twilight End | 18:37 |
| Astronomical Twilight End | 19:11 |
| Moon Illumination | 99.54% |