| Geyser | 1977-06-30 |
|---|---|
| Constant | 1800 |
| Jetsam Pool | 1800 |
| Ledge | 1800 |
| Values for Old Faithful Area | 1977-06-30 |
|---|---|
| Astronomical Twilight Begin | 03:15 |
| Nautical Twilight Begin | 04:17 |
| Civil Twilight Begin | 05:05 |
| Sunrise | 05:42 |
| Sunset | 21:11 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:36 |
| Astronomical Twilight End | 23:38 |
| Moon Illumination | 98.8% |