| Geyser | 1977-07-28 |
|---|---|
| Constant | 1303 |
| Little Whirligig | 1005, 1205 |
| Values for Old Faithful Area | 1977-07-28 |
|---|---|
| Astronomical Twilight Begin | 03:59 |
| Nautical Twilight Begin | 04:49 |
| Civil Twilight Begin | 05:32 |
| Sunrise | 06:05 |
| Sunset | 20:53 |
| Civil Twilight End | 21:27 |
| Nautical Twilight End | 22:09 |
| Astronomical Twilight End | 22:59 |
| Moon Illumination | 93.17% |