| Geyser | 1999-04-29 |
|---|---|
| Castle | 0741 E, 1417 E |
| Great Fountain | 0543 E, 1543 E |
| Values for Old Faithful Area | 1999-04-29 |
|---|---|
| Astronomical Twilight Begin | 04:22 |
| Nautical Twilight Begin | 05:05 |
| Civil Twilight Begin | 05:45 |
| Sunrise | 06:16 |
| Sunset | 20:24 |
| Civil Twilight End | 20:56 |
| Nautical Twilight End | 21:35 |
| Astronomical Twilight End | 22:18 |
| Moon Illumination | 98.29% |