| Geyser | 1967-09-20 |
|---|---|
| Blue | 1800 |
| Scummy Pool | 1800 |
| Tantalus | 0800-1615 |
| Values for Old Faithful Area | 1967-09-20 |
|---|---|
| Astronomical Twilight Begin | 05:29 |
| Nautical Twilight Begin | 06:04 |
| Civil Twilight Begin | 06:38 |
| Sunrise | 07:07 |
| Sunset | 19:26 |
| Civil Twilight End | 19:55 |
| Nautical Twilight End | 20:29 |
| Astronomical Twilight End | 21:04 |
| Moon Illumination | 97.83% |