| Geyser | 1983-08-15 |
|---|---|
| Bear Den | 1425 |
| Blue | 1600 |
| Values for Old Faithful Area | 1983-08-15 |
|---|---|
| Astronomical Twilight Begin | 04:32 |
| Nautical Twilight Begin | 05:15 |
| Civil Twilight Begin | 05:54 |
| Sunrise | 06:25 |
| Sunset | 20:29 |
| Civil Twilight End | 21:01 |
| Nautical Twilight End | 21:40 |
| Astronomical Twilight End | 22:22 |
| Moon Illumination | 46.95% |