| Geyser | 1977-10-11 |
|---|---|
| Echinus | 1730:04 |
| Values for Old Faithful Area | 1977-10-11 |
|---|---|
| Astronomical Twilight Begin | 05:57 |
| Nautical Twilight Begin | 06:30 |
| Civil Twilight Begin | 07:04 |
| Sunrise | 07:33 |
| Sunset | 18:46 |
| Civil Twilight End | 19:15 |
| Nautical Twilight End | 19:49 |
| Astronomical Twilight End | 20:22 |
| Moon Illumination | 3.36% |