| Geyser | 1968-09-01 |
|---|---|
| Bear Den | 1210 |
| Cistern Spring | 0800 |
| Echinus | 0913, 0950, 1130 |
| Little Whirligig | 1220 |
| Steamboat | 0800 |
| Values for Old Faithful Area | 1968-09-01 |
|---|---|
| Astronomical Twilight Begin | 05:02 |
| Nautical Twilight Begin | 05:40 |
| Civil Twilight Begin | 06:16 |
| Sunrise | 06:46 |
| Sunset | 19:59 |
| Civil Twilight End | 20:29 |
| Nautical Twilight End | 21:05 |
| Astronomical Twilight End | 21:43 |
| Moon Illumination | 64.44% |