| Geyser | 1977-06-23 |
|---|---|
| Echinus | 0910 |
| Little Whirligig | 1135, 1309 |
| Whirligig | 1157, 1420 |
| Values for Old Faithful Area | 1977-06-23 |
|---|---|
| Astronomical Twilight Begin | 03:10 |
| Nautical Twilight Begin | 04:13 |
| Civil Twilight Begin | 05:02 |
| Sunrise | 05:39 |
| Sunset | 21:11 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:37 |
| Astronomical Twilight End | 23:40 |
| Moon Illumination | 36.4% |