| Geyser | 1977-05-18 |
|---|---|
| Giantess | 2028 |
| Values for Old Faithful Area | 1977-05-18 |
|---|---|
| Astronomical Twilight Begin | 03:43 |
| Nautical Twilight Begin | 04:34 |
| Civil Twilight Begin | 05:18 |
| Sunrise | 05:52 |
| Sunset | 20:47 |
| Civil Twilight End | 21:21 |
| Nautical Twilight End | 22:04 |
| Astronomical Twilight End | 22:56 |
| Moon Illumination | 0.02% |