| Geyser | 1977-09-18 |
|---|---|
| Echinus | 1227 |
| Whirligig | 1525 |
| Values for Old Faithful Area | 1977-09-18 |
|---|---|
| Astronomical Twilight Begin | 05:27 |
| Nautical Twilight Begin | 06:02 |
| Civil Twilight Begin | 06:36 |
| Sunrise | 07:05 |
| Sunset | 19:28 |
| Civil Twilight End | 19:57 |
| Nautical Twilight End | 20:32 |
| Astronomical Twilight End | 21:07 |
| Moon Illumination | 27.71% |