| Geyser | 1999-02-07 |
|---|---|
| Great Fountain | 0058 E, 1128 E, 2318 E |
| Values for Old Faithful Area | 1999-02-07 |
|---|---|
| Astronomical Twilight Begin | 05:55 |
| Nautical Twilight Begin | 06:29 |
| Civil Twilight Begin | 07:04 |
| Sunrise | 07:34 |
| Sunset | 17:40 |
| Civil Twilight End | 18:10 |
| Nautical Twilight End | 18:45 |
| Astronomical Twilight End | 19:19 |
| Moon Illumination | 61.34% |