| Geyser | 1977-07-01 |
|---|---|
| Congress Pool | 1200 |
| Echinus | 0948, 1052 |
| Little Whirligig | 1350, 1525 |
| Values for Old Faithful Area | 1977-07-01 |
|---|---|
| Astronomical Twilight Begin | 03:16 |
| Nautical Twilight Begin | 04:17 |
| Civil Twilight Begin | 05:06 |
| Sunrise | 05:42 |
| Sunset | 21:11 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:36 |
| Astronomical Twilight End | 23:38 |
| Moon Illumination | 99.98% |