| Geyser | 1964-08-20 |
|---|---|
| Echinus | 1020, 1145, 1417, 1637, 1742 |
| Morning | 1615 |
| Steamboat | 1015 |
| Valentine | 0000 A |
| Values for Old Faithful Area | 1964-08-20 |
|---|---|
| Astronomical Twilight Begin | 03:42 |
| Nautical Twilight Begin | 04:23 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:32 |
| Sunset | 19:20 |
| Civil Twilight End | 19:51 |
| Nautical Twilight End | 20:29 |
| Astronomical Twilight End | 21:10 |
| Moon Illumination | 91.6% |