| Geyser | 1977-09-04 |
|---|---|
| Arsenic | 1020 A |
| Colloidal Pool | 1200 |
| Constant | 1020 A, 1025 |
| Echinus | 0854, 1052, 1154 |
| Little Whirligig | 1016 |
| Pinwheel | 1200 |
| Scummy Pool | 1200 |
| Splutter Pot | 1025 |
| Sunday | 1200 |
| Valentine | 1745 |
| Whirligig | 1025 |
| Values for Old Faithful Area | 1977-09-04 |
|---|---|
| Astronomical Twilight Begin | 05:06 |
| Nautical Twilight Begin | 05:44 |
| Civil Twilight Begin | 06:19 |
| Sunrise | 06:49 |
| Sunset | 19:54 |
| Civil Twilight End | 20:24 |
| Nautical Twilight End | 21:00 |
| Astronomical Twilight End | 21:37 |
| Moon Illumination | 62.69% |