| Geyser | 1966-07-28 |
|---|---|
| Echinus | 0828, 0926, 1025, 1123, 1417, 1517, 1616 |
| Ledge | 0915 A |
| Steamboat | 1800 |
| Values for Old Faithful Area | 1966-07-28 |
|---|---|
| Astronomical Twilight Begin | 03:59 |
| Nautical Twilight Begin | 04:49 |
| Civil Twilight Begin | 05:31 |
| Sunrise | 06:05 |
| Sunset | 20:53 |
| Civil Twilight End | 21:27 |
| Nautical Twilight End | 22:10 |
| Astronomical Twilight End | 23:00 |
| Moon Illumination | 83.8% |