| Geyser | 1978-08-21 |
|---|---|
| Dark Cavern | 0910 |
| Echinus | 0840, 1003, 1122, 1239, 1406, 1450 |
| Whirligig | 0815, 0900 |
| Values for Old Faithful Area | 1978-08-21 |
|---|---|
| Astronomical Twilight Begin | 04:43 |
| Nautical Twilight Begin | 05:24 |
| Civil Twilight Begin | 06:02 |
| Sunrise | 06:33 |
| Sunset | 20:19 |
| Civil Twilight End | 20:50 |
| Nautical Twilight End | 21:28 |
| Astronomical Twilight End | 22:09 |
| Moon Illumination | 89.19% |