| Geyser | 1977-08-17 |
|---|---|
| Echinus | 1037 |
| Little Whirligig | 1225 |
| Values for Old Faithful Area | 1977-08-17 |
|---|---|
| Astronomical Twilight Begin | 04:37 |
| Nautical Twilight Begin | 05:19 |
| Civil Twilight Begin | 05:57 |
| Sunrise | 06:28 |
| Sunset | 20:25 |
| Civil Twilight End | 20:57 |
| Nautical Twilight End | 21:35 |
| Astronomical Twilight End | 22:17 |
| Moon Illumination | 6.09% |