| Geyser | 1999-04-06 |
|---|---|
| Great Fountain | 0323 E, 1513 E |
| Values for Old Faithful Area | 1999-04-06 |
|---|---|
| Astronomical Twilight Begin | 05:12 |
| Nautical Twilight Begin | 05:50 |
| Civil Twilight Begin | 06:25 |
| Sunrise | 06:55 |
| Sunset | 19:56 |
| Civil Twilight End | 20:25 |
| Nautical Twilight End | 21:01 |
| Astronomical Twilight End | 21:38 |
| Moon Illumination | 76.27% |