| Geyser | 1964-08-15 |
|---|---|
| Bear Den | 1732 |
| Blue | 1820 ie |
| Congress Pool | 1800 |
| Ebony | 1731 min |
| Echinus | 0837, 1001, 1427, 1556, 1711 |
| Guardian | 0720 |
| Pinwheel | 0915 |
| Steamboat | 0730 |
| Valentine | 0925, 1010 |
| Values for Old Faithful Area | 1964-08-15 |
|---|---|
| Astronomical Twilight Begin | 03:33 |
| Nautical Twilight Begin | 04:16 |
| Civil Twilight Begin | 04:55 |
| Sunrise | 05:26 |
| Sunset | 19:28 |
| Civil Twilight End | 20:00 |
| Nautical Twilight End | 20:38 |
| Astronomical Twilight End | 21:21 |
| Moon Illumination | 51.38% |