| Geyser | 1977-08-09 |
|---|---|
| Echinus | 0908, 1115 |
| Little Whirligig | 1330, 1510 |
| Veteran | 0915 |
| Values for Old Faithful Area | 1977-08-09 |
|---|---|
| Astronomical Twilight Begin | 04:22 |
| Nautical Twilight Begin | 05:07 |
| Civil Twilight Begin | 05:47 |
| Sunrise | 06:19 |
| Sunset | 20:38 |
| Civil Twilight End | 21:10 |
| Nautical Twilight End | 21:50 |
| Astronomical Twilight End | 22:34 |
| Moon Illumination | 28.09% |