| Geyser | 1976-12-06 |
|---|---|
| Great Fountain | 1420 |
| Values for Old Faithful Area | 1976-12-06 |
|---|---|
| Astronomical Twilight Begin | 06:00 |
| Nautical Twilight Begin | 06:35 |
| Civil Twilight Begin | 07:12 |
| Sunrise | 07:45 |
| Sunset | 16:43 |
| Civil Twilight End | 17:16 |
| Nautical Twilight End | 17:53 |
| Astronomical Twilight End | 18:28 |
| Moon Illumination | 99.8% |