| Geyser | 1977-07-25 |
|---|---|
| Echinus | 1047 |
| Ledge | 0800-1200 |
| Little Whirligig | 0830 ie, 1130 ie, 1320 ie |
| Values for Old Faithful Area | 1977-07-25 |
|---|---|
| Astronomical Twilight Begin | 03:54 |
| Nautical Twilight Begin | 04:45 |
| Civil Twilight Begin | 05:28 |
| Sunrise | 06:02 |
| Sunset | 20:56 |
| Civil Twilight End | 21:30 |
| Nautical Twilight End | 22:14 |
| Astronomical Twilight End | 23:05 |
| Moon Illumination | 66.17% |