| Geyser | 1974-08-04 |
|---|---|
| Constant | 1600 |
| Ebony | 1334 |
| Echinus | 0829, 0950, 1112, 1233, 1253, 1400, 1516, 1637 |
| Harding | 0845 |
| Ledge | 1156 |
| Little Whirligig | 1017, 1540 |
| Valentine | 1312 |
| Whirligig | 1337, 1414, 1551 |
| Values for Old Faithful Area | 1974-08-04 |
|---|---|
| Astronomical Twilight Begin | 04:12 |
| Nautical Twilight Begin | 04:59 |
| Civil Twilight Begin | 05:40 |
| Sunrise | 06:13 |
| Sunset | 20:45 |
| Civil Twilight End | 21:18 |
| Nautical Twilight End | 21:59 |
| Astronomical Twilight End | 22:46 |
| Moon Illumination | 98.92% |