| Geyser | 1981-06-13 |
|---|---|
| Echinus | 1454 |
| Steamvalve Spring | 1640 |
| Whirligig | 0922, 1456 |
| Values for Old Faithful Area | 1981-06-13 |
|---|---|
| Astronomical Twilight Begin | 03:10 |
| Nautical Twilight Begin | 04:12 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:37 |
| Sunset | 21:08 |
| Civil Twilight End | 21:45 |
| Nautical Twilight End | 22:33 |
| Astronomical Twilight End | 23:36 |
| Moon Illumination | 83.29% |