| Geyser | 1999-02-27 |
|---|---|
| Great Fountain | 0658 E, 1638 E |
| Values for Old Faithful Area | 1999-02-27 |
|---|---|
| Astronomical Twilight Begin | 05:27 |
| Nautical Twilight Begin | 06:01 |
| Civil Twilight Begin | 06:34 |
| Sunrise | 07:04 |
| Sunset | 18:08 |
| Civil Twilight End | 18:37 |
| Nautical Twilight End | 19:10 |
| Astronomical Twilight End | 19:44 |
| Moon Illumination | 90.21% |