| Geyser | 1981-07-27 |
|---|---|
| Arsenic | 1130 ie |
| Constant | 1146 |
| Echinus | 0845, 0934, 1026, 1204, 1612 |
| Guardian | 1050 |
| Morning | 0130, 1019, 1615, 2313 |
| Sunday | 1900 |
| Valentine | 1056 |
| Whirligig | 1059, 1133 |
| Values for Old Faithful Area | 1981-07-27 |
|---|---|
| Astronomical Twilight Begin | 03:58 |
| Nautical Twilight Begin | 04:48 |
| Civil Twilight Begin | 05:31 |
| Sunrise | 06:04 |
| Sunset | 20:54 |
| Civil Twilight End | 21:28 |
| Nautical Twilight End | 22:11 |
| Astronomical Twilight End | 23:01 |
| Moon Illumination | 19.39% |