| Geyser | 1979-07-22 |
|---|---|
| Bear Den | 1641 |
| Constant | 1040 |
| Echinus | 1400 |
| Little Whirligig | 1020 |
| Values for Old Faithful Area | 1979-07-22 |
|---|---|
| Astronomical Twilight Begin | 03:47 |
| Nautical Twilight Begin | 04:40 |
| Civil Twilight Begin | 05:24 |
| Sunrise | 05:59 |
| Sunset | 21:00 |
| Civil Twilight End | 21:34 |
| Nautical Twilight End | 22:18 |
| Astronomical Twilight End | 23:11 |
| Moon Illumination | 3.19% |