| Geyser | 1977-08-02 |
|---|---|
| Black Growler | 1200 |
| Constant | 0920 |
| Echinus | 0850, 1058, 1154 |
| Ledge | 1200 |
| Little Whirligig | 0915, 1410 |
| Values for Old Faithful Area | 1977-08-02 |
|---|---|
| Astronomical Twilight Begin | 04:09 |
| Nautical Twilight Begin | 04:56 |
| Civil Twilight Begin | 05:38 |
| Sunrise | 06:11 |
| Sunset | 20:47 |
| Civil Twilight End | 21:20 |
| Nautical Twilight End | 22:02 |
| Astronomical Twilight End | 22:49 |
| Moon Illumination | 90.23% |