| Geyser | 1987-08-17 |
|---|---|
| Congress Pool | 1200 |
| Corporal | 1200 |
| Dog's Leg Spring | 1200 |
| Palpitator Spring | 1200 |
| Steamboat | 1200 |
| Values for Old Faithful Area | 1987-08-17 |
|---|---|
| Astronomical Twilight Begin | 04:36 |
| Nautical Twilight Begin | 05:18 |
| Civil Twilight Begin | 05:56 |
| Sunrise | 06:28 |
| Sunset | 20:26 |
| Civil Twilight End | 20:57 |
| Nautical Twilight End | 21:36 |
| Astronomical Twilight End | 22:18 |
| Moon Illumination | 41.09% |