| Geyser | 1987-07-07 |
|---|---|
| Echinus | 1800 |
| Graceful | 1800 |
| Values for Old Faithful Area | 1987-07-07 |
|---|---|
| Astronomical Twilight Begin | 03:23 |
| Nautical Twilight Begin | 04:22 |
| Civil Twilight Begin | 05:10 |
| Sunrise | 05:46 |
| Sunset | 21:10 |
| Civil Twilight End | 21:46 |
| Nautical Twilight End | 22:33 |
| Astronomical Twilight End | 23:33 |
| Moon Illumination | 79.34% |