| Geyser | 1999-04-09 |
|---|---|
| Great Fountain | 1008 E |
| Values for Old Faithful Area | 1999-04-09 |
|---|---|
| Astronomical Twilight Begin | 05:06 |
| Nautical Twilight Begin | 05:44 |
| Civil Twilight Begin | 06:20 |
| Sunrise | 06:49 |
| Sunset | 20:00 |
| Civil Twilight End | 20:29 |
| Nautical Twilight End | 21:05 |
| Astronomical Twilight End | 21:43 |
| Moon Illumination | 48.74% |