| Geyser | 1964-05-20 |
|---|---|
| Steamboat | 0915 |
| Valentine | 0740 A |
| Values for Old Faithful Area | 1964-05-20 |
|---|---|
| Astronomical Twilight Begin | 02:39 |
| Nautical Twilight Begin | 03:31 |
| Civil Twilight Begin | 04:15 |
| Sunrise | 04:50 |
| Sunset | 19:49 |
| Civil Twilight End | 20:23 |
| Nautical Twilight End | 21:07 |
| Astronomical Twilight End | 22:00 |
| Moon Illumination | 68.2% |