| Geyser | 1981-08-15 |
|---|---|
| Blue Mud Steam Vent | 1200 |
| Echinus | 0900, 1000, 1049 min, 1056, 1620 |
| Little Whirligig | 1255 |
| Morning | 0009, 1006, 2353 |
| UNNG-NBK-8 | 1200 |
| Whirligig | 1524 |
| Values for Old Faithful Area | 1981-08-15 |
|---|---|
| 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 | 99.77% |