| Geyser | 1983-07-21 |
|---|---|
| Arsenic | 1433 |
| Echinus | 0918, 0958, 1121, 1458 |
| Splutter Pot | 1412, 1417, 1422 |
| Whirligig | 1200 A, 1435 |
| Values for Old Faithful Area | 1983-07-21 |
|---|---|
| Astronomical Twilight Begin | 03:45 |
| Nautical Twilight Begin | 04:39 |
| Civil Twilight Begin | 05:23 |
| Sunrise | 05:58 |
| Sunset | 21:01 |
| Civil Twilight End | 21:35 |
| Nautical Twilight End | 22:20 |
| Astronomical Twilight End | 23:13 |
| Moon Illumination | 87.57% |