| Geyser | 1976-12-21 |
|---|---|
| Old Faithful | 1211 long, 1430 short, 1517 long, 1639 short |
| Values for Old Faithful Area | 1976-12-21 |
|---|---|
| Astronomical Twilight Begin | 06:11 |
| Nautical Twilight Begin | 06:46 |
| Civil Twilight Begin | 07:23 |
| Sunrise | 07:56 |
| Sunset | 16:46 |
| Civil Twilight End | 17:20 |
| Nautical Twilight End | 17:56 |
| Astronomical Twilight End | 18:32 |
| Moon Illumination | 0.07% |