| Geyser | 1964-09-20 |
|---|---|
| Echinus | 0850, 1000, 1108, 1215, 1320, 1419, 1520 |
| Steamboat | 0825-1200, 1245 |
| Values for Old Faithful Area | 1964-09-20 |
|---|---|
| Astronomical Twilight Begin | 04:30 |
| Nautical Twilight Begin | 05:05 |
| Civil Twilight Begin | 05:39 |
| Sunrise | 06:08 |
| Sunset | 18:24 |
| Civil Twilight End | 18:53 |
| Nautical Twilight End | 19:27 |
| Astronomical Twilight End | 20:02 |
| Moon Illumination | 97.59% |