| Geyser | 1977-09-11 |
|---|---|
| Constant | 1105, 1227 |
| Echinus | 1010, 1441 |
| Grand | 0605 |
| Little Whirligig | 1145, 1237 |
| Splutter Pot | 1100 |
| Whirligig | 1100 |
| Values for Old Faithful Area | 1977-09-11 |
|---|---|
| Astronomical Twilight Begin | 05:17 |
| Nautical Twilight Begin | 05:53 |
| Civil Twilight Begin | 06:28 |
| Sunrise | 06:57 |
| Sunset | 19:41 |
| Civil Twilight End | 20:11 |
| Nautical Twilight End | 20:46 |
| Astronomical Twilight End | 21:22 |
| Moon Illumination | 5.27% |