| Geyser | 1977-08-27 |
|---|---|
| Constant | 1644 |
| Echinus | 1425 |
| Little Whirligig | 1630 ie |
| Valentine | 1130 |
| Whirligig | 1120, 1635 |
| Values for Old Faithful Area | 1977-08-27 |
|---|---|
| Astronomical Twilight Begin | 04:54 |
| Nautical Twilight Begin | 05:33 |
| Civil Twilight Begin | 06:10 |
| Sunrise | 06:40 |
| Sunset | 20:09 |
| Civil Twilight End | 20:39 |
| Nautical Twilight End | 21:16 |
| Astronomical Twilight End | 21:55 |
| Moon Illumination | 96.75% |