| Geyser | 1964-09-13 |
|---|---|
| Echinus | 1800 |
| Little Whirligig | 1800 |
| Steamboat | 2230 |
| Values for Old Faithful Area | 1964-09-13 |
|---|---|
| Astronomical Twilight Begin | 04:20 |
| Nautical Twilight Begin | 04:56 |
| Civil Twilight Begin | 05:31 |
| Sunrise | 06:00 |
| Sunset | 18:37 |
| Civil Twilight End | 19:07 |
| Nautical Twilight End | 19:41 |
| Astronomical Twilight End | 20:17 |
| Moon Illumination | 44.34% |