| Geyser | 1964-07-31 |
|---|---|
| Echinus | 0932, 1053, 1216, 1320, 1429, 1537, 1642 |
| Steamboat | 0100 |
| Valentine | 0000 A |
| Values for Old Faithful Area | 1964-07-31 |
|---|---|
| Astronomical Twilight Begin | 03:05 |
| Nautical Twilight Begin | 03:54 |
| Civil Twilight Begin | 04:36 |
| Sunrise | 05:09 |
| Sunset | 19:49 |
| Civil Twilight End | 20:23 |
| Nautical Twilight End | 21:05 |
| Astronomical Twilight End | 21:53 |
| Moon Illumination | 59.6% |