| Geyser | 1977-07-27 |
|---|---|
| Echinus | 1035 |
| Little Whirligig | 1215 |
| Values for Old Faithful Area | 1977-07-27 |
|---|---|
| Astronomical Twilight Begin | 03:57 |
| Nautical Twilight Begin | 04:48 |
| Civil Twilight Begin | 05:31 |
| Sunrise | 06:04 |
| Sunset | 20:54 |
| Civil Twilight End | 21:28 |
| Nautical Twilight End | 22:11 |
| Astronomical Twilight End | 23:01 |
| Moon Illumination | 85.92% |