| Geyser | 1981-09-23 |
|---|---|
| Echinus | 1458:30 |
| Values for Old Faithful Area | 1981-09-23 |
|---|---|
| Astronomical Twilight Begin | 05:34 |
| Nautical Twilight Begin | 06:08 |
| Civil Twilight Begin | 06:42 |
| Sunrise | 07:11 |
| Sunset | 19:19 |
| Civil Twilight End | 19:48 |
| Nautical Twilight End | 20:22 |
| Astronomical Twilight End | 20:57 |
| Moon Illumination | 24.42% |