| Geyser | 1987-08-24 |
|---|---|
| Blue Mud Steam Vent | 1200 |
| Branch Spring | 1200 |
| Cistern Spring | 1200 |
| Corporal | 1200 |
| Fearless | 1200 |
| Monarch | 1200 |
| Pearl | 1200 |
| Porkchop | 1200 |
| Puff-n-Stuff | 1200 |
| Steamboat | 1200 |
| Yellow Funnel Spring | 1200 |
| Values for Old Faithful Area | 1987-08-24 |
|---|---|
| Astronomical Twilight Begin | 04:48 |
| Nautical Twilight Begin | 05:28 |
| Civil Twilight Begin | 06:05 |
| Sunrise | 06:36 |
| Sunset | 20:14 |
| Civil Twilight End | 20:45 |
| Nautical Twilight End | 21:22 |
| Astronomical Twilight End | 22:02 |
| Moon Illumination | 0.06% |