| Geyser | 1981-01-23 |
|---|---|
| Giantess | 1312 |
| Values for Old Faithful Area | 1981-01-23 |
|---|---|
| Astronomical Twilight Begin | 06:08 |
| Nautical Twilight Begin | 06:43 |
| Civil Twilight Begin | 07:18 |
| Sunrise | 07:50 |
| Sunset | 17:20 |
| Civil Twilight End | 17:51 |
| Nautical Twilight End | 18:27 |
| Astronomical Twilight End | 19:01 |
| Moon Illumination | 90.49% |