| Geyser | 1977-09-24 |
|---|---|
| Constant | 1741 |
| Values for Old Faithful Area | 1977-09-24 |
|---|---|
| Astronomical Twilight Begin | 05:35 |
| Nautical Twilight Begin | 06:10 |
| Civil Twilight Begin | 06:44 |
| Sunrise | 07:13 |
| Sunset | 19:17 |
| Civil Twilight End | 19:46 |
| Nautical Twilight End | 20:20 |
| Astronomical Twilight End | 20:55 |
| Moon Illumination | 89.21% |