| Geyser | 1987-07-11 |
|---|---|
| Echinus | 1031, 1325, 1630 |
| Values for Old Faithful Area | 1987-07-11 |
|---|---|
| Astronomical Twilight Begin | 03:28 |
| Nautical Twilight Begin | 04:26 |
| Civil Twilight Begin | 05:13 |
| Sunrise | 05:49 |
| Sunset | 21:08 |
| Civil Twilight End | 21:44 |
| Nautical Twilight End | 22:30 |
| Astronomical Twilight End | 23:28 |
| Moon Illumination | 99.99% |