| Geyser | 1977-08-04 |
|---|---|
| Echinus | 1000 |
| Little Whirligig | 1507 |
| Valentine | 1205 |
| Values for Old Faithful Area | 1977-08-04 |
|---|---|
| Astronomical Twilight Begin | 04:13 |
| Nautical Twilight Begin | 04:59 |
| Civil Twilight Begin | 05:40 |
| Sunrise | 06:13 |
| Sunset | 20:44 |
| Civil Twilight End | 21:17 |
| Nautical Twilight End | 21:58 |
| Astronomical Twilight End | 22:45 |
| Moon Illumination | 74.59% |