| Geyser | 1979-07-27 |
|---|---|
| Constant | 1130 A |
| Echinus | 0912, 1027 |
| Little Whirligig | 0832, 1004, 1130 A |
| Values for Old Faithful Area | 1979-07-27 |
|---|---|
| Astronomical Twilight Begin | 03:57 |
| Nautical Twilight Begin | 04:47 |
| Civil Twilight Begin | 05:30 |
| Sunrise | 06:04 |
| Sunset | 20:55 |
| Civil Twilight End | 21:29 |
| Nautical Twilight End | 22:12 |
| Astronomical Twilight End | 23:02 |
| Moon Illumination | 8.94% |