| Geyser | 1981-07-11 |
|---|---|
| Echinus | 0940, 1023, 1104 |
| Values for Old Faithful Area | 1981-07-11 |
|---|---|
| Astronomical Twilight Begin | 03:29 |
| Nautical Twilight Begin | 04:27 |
| Civil Twilight Begin | 05:13 |
| Sunrise | 05:49 |
| Sunset | 21:08 |
| Civil Twilight End | 21:43 |
| Nautical Twilight End | 22:30 |
| Astronomical Twilight End | 23:28 |
| Moon Illumination | 69.86% |