| Geyser | 1964-07-21 |
|---|---|
| Echinus | 0740, 0847, 0952, 1103, 1213, 1319, 1430, 1540, 1750 |
| Pinwheel | 0923, 1315, 1429 |
| Steamboat | 0900 |
| Valentine | 0925 |
| Values for Old Faithful Area | 1964-07-21 |
|---|---|
| Astronomical Twilight Begin | 02:46 |
| Nautical Twilight Begin | 03:39 |
| Civil Twilight Begin | 04:24 |
| Sunrise | 04:58 |
| Sunset | 20:00 |
| Civil Twilight End | 20:35 |
| Nautical Twilight End | 21:19 |
| Astronomical Twilight End | 22:12 |
| Moon Illumination | 89.8% |