| Geyser | 1981-08-16 |
|---|---|
| Echinus | 1203, 1502, 1603 |
| Giantess | 1041 |
| Morning | 1116, 2247 |
| Yellow Funnel Spring | 1200 |
| Values for Old Faithful Area | 1981-08-16 |
|---|---|
| Astronomical Twilight Begin | 04:35 |
| Nautical Twilight Begin | 05:17 |
| Civil Twilight Begin | 05:56 |
| Sunrise | 06:27 |
| Sunset | 20:27 |
| Civil Twilight End | 20:58 |
| Nautical Twilight End | 21:37 |
| Astronomical Twilight End | 22:19 |
| Moon Illumination | 99.63% |