| Geyser | 1977-09-12 |
|---|---|
| Constant | 1010 |
| Echinus | 0910, 1201, 1457, 1607 |
| Little Whirligig | 0845, 1005, 1300 |
| Values for Old Faithful Area | 1977-09-12 |
|---|---|
| Astronomical Twilight Begin | 05:18 |
| Nautical Twilight Begin | 05:54 |
| Civil Twilight Begin | 06:29 |
| Sunrise | 06:58 |
| Sunset | 19:39 |
| Civil Twilight End | 20:09 |
| Nautical Twilight End | 20:44 |
| Astronomical Twilight End | 21:20 |
| Moon Illumination | 1.57% |