| Geyser | 1977-07-10 |
|---|---|
| Black Growler | 1200 |
| Constant | 1233, 1300 |
| Echinus | 0915 ie, 1228, 1449, 1552 |
| Ledge | 1200 |
| Little Whirligig | 1040, 1250 |
| Splutter Pot | 1304 |
| Valentine | 1045 |
| Whirligig | 1320 |
| Values for Old Faithful Area | 1977-07-10 |
|---|---|
| Astronomical Twilight Begin | 03:27 |
| Nautical Twilight Begin | 04:26 |
| Civil Twilight Begin | 05:12 |
| Sunrise | 05:48 |
| Sunset | 21:08 |
| Civil Twilight End | 21:44 |
| Nautical Twilight End | 22:31 |
| Astronomical Twilight End | 23:29 |
| Moon Illumination | 30.72% |