| Geyser | 1976-12-20 |
|---|---|
| Depression | 1551 |
| Values for Old Faithful Area | 1976-12-20 |
|---|---|
| Astronomical Twilight Begin | 06:10 |
| Nautical Twilight Begin | 06:46 |
| Civil Twilight Begin | 07:22 |
| Sunrise | 07:56 |
| Sunset | 16:46 |
| Civil Twilight End | 17:19 |
| Nautical Twilight End | 17:56 |
| Astronomical Twilight End | 18:31 |
| Moon Illumination | 0.9% |