| Geyser | 1999-04-14 |
|---|---|
| Great Fountain | 0243 E, 1533 E |
| Values for Old Faithful Area | 1999-04-14 |
|---|---|
| Astronomical Twilight Begin | 04:55 |
| Nautical Twilight Begin | 05:34 |
| Civil Twilight Begin | 06:10 |
| Sunrise | 06:41 |
| Sunset | 20:06 |
| Civil Twilight End | 20:36 |
| Nautical Twilight End | 21:12 |
| Astronomical Twilight End | 21:51 |
| Moon Illumination | 5.33% |