| Geyser | 1974-08-01 |
|---|---|
| Constant | 0958, 1102 |
| Echinus | 1019, 1148, 1443, 1614, 1747 |
| Ledge | 1119 |
| Little Whirligig | 0948, 0950, 1056, 1059 |
| Pinwheel | 1200 |
| Valentine | 0800, 1415 |
| Whirligig | 0904, 0934, 0959, 1038, 1108, 1234 |
| Values for Old Faithful Area | 1974-08-01 |
|---|---|
| Astronomical Twilight Begin | 04:06 |
| Nautical Twilight Begin | 04:54 |
| Civil Twilight Begin | 05:36 |
| Sunrise | 06:10 |
| Sunset | 20:49 |
| Civil Twilight End | 21:22 |
| Nautical Twilight End | 22:04 |
| Astronomical Twilight End | 22:52 |
| Moon Illumination | 96.74% |