| Geyser | 1981-07-12 |
|---|---|
| Echinus | 0937, 1022, 1449 |
| Values for Old Faithful Area | 1981-07-12 |
|---|---|
| Astronomical Twilight Begin | 03:31 |
| Nautical Twilight Begin | 04:28 |
| Civil Twilight Begin | 05:14 |
| Sunrise | 05:50 |
| Sunset | 21:07 |
| Civil Twilight End | 21:43 |
| Nautical Twilight End | 22:29 |
| Astronomical Twilight End | 23:26 |
| Moon Illumination | 78.16% |