| Geyser | 1979-08-21 |
|---|---|
| Echinus | 1441, 1616 |
| Emerald Spring | 1200 |
| Little Whirligig | 1525 |
| Values for Old Faithful Area | 1979-08-21 |
|---|---|
| Astronomical Twilight Begin | 04:43 |
| Nautical Twilight Begin | 05:24 |
| Civil Twilight Begin | 06:01 |
| Sunrise | 06:32 |
| Sunset | 20:20 |
| Civil Twilight End | 20:51 |
| Nautical Twilight End | 21:28 |
| Astronomical Twilight End | 22:09 |
| Moon Illumination | 1.96% |