| Geyser | 1999-04-05 |
|---|---|
| Great Fountain | 0243 E, 1538 E |
| Values for Old Faithful Area | 1999-04-05 |
|---|---|
| Astronomical Twilight Begin | 05:15 |
| Nautical Twilight Begin | 05:52 |
| Civil Twilight Begin | 06:27 |
| Sunrise | 06:57 |
| Sunset | 19:55 |
| Civil Twilight End | 20:24 |
| Nautical Twilight End | 20:59 |
| Astronomical Twilight End | 21:37 |
| Moon Illumination | 83.81% |