| Geyser | 1977-06-28 |
|---|---|
| Cats Eye Spring | 1200 |
| Congress Pool | 1200 |
| Constant | 1335, 1410, 1608 |
| Dark Cavern | 1200 |
| Echinus | 1530 ie |
| Little Whirligig | 1605 |
| Steamboat | 1200 |
| Whirligig | 1308 A, 1410 |
| Values for Old Faithful Area | 1977-06-28 |
|---|---|
| Astronomical Twilight Begin | 03:13 |
| Nautical Twilight Begin | 04:16 |
| Civil Twilight Begin | 05:04 |
| Sunrise | 05:41 |
| Sunset | 21:12 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:37 |
| Astronomical Twilight End | 23:39 |
| Moon Illumination | 87.88% |