| Geyser | 1977-09-19 |
|---|---|
| Echinus | 1327, 1546 |
| Little Whirligig | 1435 |
| Values for Old Faithful Area | 1977-09-19 |
|---|---|
| Astronomical Twilight Begin | 05:28 |
| Nautical Twilight Begin | 06:03 |
| Civil Twilight Begin | 06:38 |
| Sunrise | 07:07 |
| Sunset | 19:26 |
| Civil Twilight End | 19:55 |
| Nautical Twilight End | 20:30 |
| Astronomical Twilight End | 21:05 |
| Moon Illumination | 38.54% |