| Geyser | 1977-08-15 |
|---|---|
| Blue | 1800 |
| Constant | 1040, 1205 A, 1350, 1425, 1535 |
| Echinus | 1039, 1607 |
| Little Whirligig | 1030, 1215, 1345, 1535 |
| Valentine | 1240 |
| Values for Old Faithful Area | 1977-08-15 |
|---|---|
| Astronomical Twilight Begin | 04:33 |
| Nautical Twilight Begin | 05:16 |
| Civil Twilight Begin | 05:54 |
| Sunrise | 06:26 |
| Sunset | 20:28 |
| Civil Twilight End | 21:00 |
| Nautical Twilight End | 21:39 |
| Astronomical Twilight End | 22:21 |
| Moon Illumination | 0.13% |