| Geyser | 1977-08-10 |
|---|---|
| Little Whirligig | 1030, 1225 |
| Values for Old Faithful Area | 1977-08-10 |
|---|---|
| Astronomical Twilight Begin | 04:24 |
| Nautical Twilight Begin | 05:08 |
| Civil Twilight Begin | 05:48 |
| Sunrise | 06:20 |
| Sunset | 20:36 |
| Civil Twilight End | 21:08 |
| Nautical Twilight End | 21:48 |
| Astronomical Twilight End | 22:32 |
| Moon Illumination | 19.98% |