| Geyser | 1964-06-21 |
|---|---|
| Bear Den | 1500 |
| Dark Cavern | 1500 |
| Echinus | 0941, 1240, 1412, 1646 |
| Values for Old Faithful Area | 1964-06-21 |
|---|---|
| Astronomical Twilight Begin | 02:09 |
| Nautical Twilight Begin | 03:13 |
| Civil Twilight Begin | 04:01 |
| Sunrise | 04:38 |
| Sunset | 20:11 |
| Civil Twilight End | 20:48 |
| Nautical Twilight End | 21:37 |
| Astronomical Twilight End | 22:40 |
| Moon Illumination | 87.72% |