| Geyser | 1977-08-07 |
|---|---|
| Constant | 1542, 1645 |
| Echinus | 0630, 1057, 1205 |
| Harding | 0945 |
| Little Whirligig | 0830 A, 1425, 1605 |
| Valentine | 1530 |
| Values for Old Faithful Area | 1977-08-07 |
|---|---|
| Astronomical Twilight Begin | 04:18 |
| Nautical Twilight Begin | 05:04 |
| Civil Twilight Begin | 05:44 |
| Sunrise | 06:17 |
| Sunset | 20:40 |
| Civil Twilight End | 21:13 |
| Nautical Twilight End | 21:53 |
| Astronomical Twilight End | 22:39 |
| Moon Illumination | 46.31% |