| Geyser | 1987-08-02 |
|---|---|
| Crater Spring | 1200, 1800 |
| Dog's Leg Spring | 1200 |
| Pearl | 1200 |
| Porkchop | 1200 |
| Rubble | 1800 |
| Veteran | 1200 |
| Vixen | 1200 |
| Values for Old Faithful Area | 1987-08-02 |
|---|---|
| Astronomical Twilight Begin | 04:08 |
| Nautical Twilight Begin | 04:56 |
| Civil Twilight Begin | 05:37 |
| Sunrise | 06:11 |
| Sunset | 20:48 |
| Civil Twilight End | 21:21 |
| Nautical Twilight End | 22:02 |
| Astronomical Twilight End | 22:50 |
| Moon Illumination | 44.22% |