| Geyser | 1964-05-21 |
|---|---|
| Steamboat | 1200 |
| Values for Old Faithful Area | 1964-05-21 |
|---|---|
| Astronomical Twilight Begin | 02:37 |
| Nautical Twilight Begin | 03:30 |
| Civil Twilight Begin | 04:14 |
| Sunrise | 04:49 |
| Sunset | 19:50 |
| Civil Twilight End | 20:25 |
| Nautical Twilight End | 21:09 |
| Astronomical Twilight End | 22:02 |
| Moon Illumination | 77.23% |