| Geyser | 1977-09-27 |
|---|---|
| Echinus | 0905 |
| Little Whirligig | 1715 |
| Values for Old Faithful Area | 1977-09-27 |
|---|---|
| Astronomical Twilight Begin | 05:39 |
| Nautical Twilight Begin | 06:13 |
| Civil Twilight Begin | 06:47 |
| Sunrise | 07:16 |
| Sunset | 19:11 |
| Civil Twilight End | 19:40 |
| Nautical Twilight End | 20:14 |
| Astronomical Twilight End | 20:49 |
| Moon Illumination | 99.99% |