| Geyser | 1964-07-28 |
|---|---|
| Ebony | 1439 |
| Echinus | 0725, 0834, 0949, 1100, 1128, 1218, 1447, 1602 |
| Pinwheel | 1012 |
| Sunday | 1230 |
| Valentine | 1530 |
| Values for Old Faithful Area | 1964-07-28 |
|---|---|
| Astronomical Twilight Begin | 03:00 |
| Nautical Twilight Begin | 03:49 |
| Civil Twilight Begin | 04:32 |
| Sunrise | 05:06 |
| Sunset | 19:53 |
| Civil Twilight End | 20:27 |
| Nautical Twilight End | 21:09 |
| Astronomical Twilight End | 21:59 |
| Moon Illumination | 87.1% |