| Geyser | 1983-07-30 |
|---|---|
| Bear Den | 1230 |
| Blue | 1730 |
| Values for Old Faithful Area | 1983-07-30 |
|---|---|
| Astronomical Twilight Begin | 04:02 |
| Nautical Twilight Begin | 04:51 |
| Civil Twilight Begin | 05:34 |
| Sunrise | 06:07 |
| Sunset | 20:51 |
| Civil Twilight End | 21:25 |
| Nautical Twilight End | 22:07 |
| Astronomical Twilight End | 22:56 |
| Moon Illumination | 76.59% |