| Geyser | 1981-07-04 |
|---|---|
| Echinus | 0930, 1043 |
| Giantess | 2112 ie |
| Little Whirligig | 1105, 1315 |
| Steamvalve Spring | 1125 |
| Sunday | 1900 |
| Veteran | 0845, 0859, 0913, 1115 |
| Values for Old Faithful Area | 1981-07-04 |
|---|---|
| Astronomical Twilight Begin | 03:19 |
| Nautical Twilight Begin | 04:20 |
| Civil Twilight Begin | 05:08 |
| Sunrise | 05:44 |
| Sunset | 21:11 |
| Civil Twilight End | 21:47 |
| Nautical Twilight End | 22:35 |
| Astronomical Twilight End | 23:35 |
| Moon Illumination | 7.85% |