| Geyser | 1977-09-10 |
|---|---|
| Echinus | 0936, 1142 |
| Little Whirligig | 1242, 1625 |
| Values for Old Faithful Area | 1977-09-10 |
|---|---|
| Astronomical Twilight Begin | 05:15 |
| Nautical Twilight Begin | 05:52 |
| Civil Twilight Begin | 06:27 |
| Sunrise | 06:56 |
| Sunset | 19:43 |
| Civil Twilight End | 20:13 |
| Nautical Twilight End | 20:48 |
| Astronomical Twilight End | 21:24 |
| Moon Illumination | 10.79% |