| Geyser | 1987-09-30 |
|---|---|
| Colloidal Pool | 1200 |
| Values for Old Faithful Area | 1987-09-30 |
|---|---|
| Astronomical Twilight Begin | 05:42 |
| Nautical Twilight Begin | 06:17 |
| Civil Twilight Begin | 06:50 |
| Sunrise | 07:19 |
| Sunset | 19:07 |
| Civil Twilight End | 19:35 |
| Nautical Twilight End | 20:09 |
| Astronomical Twilight End | 20:43 |
| Moon Illumination | 47.81% |