| Geyser | 1999-02-15 |
|---|---|
| Great Fountain | 0318 E, 1358 E |
| Values for Old Faithful Area | 1999-02-15 |
|---|---|
| Astronomical Twilight Begin | 05:45 |
| Nautical Twilight Begin | 06:19 |
| Civil Twilight Begin | 06:53 |
| Sunrise | 07:23 |
| Sunset | 17:51 |
| Civil Twilight End | 18:21 |
| Nautical Twilight End | 18:55 |
| Astronomical Twilight End | 19:29 |
| Moon Illumination | 1.19% |