| Geyser | 1981-10-21 |
|---|---|
| Giantess | 0850 ie |
| Values for Old Faithful Area | 1981-10-21 |
|---|---|
| Astronomical Twilight Begin | 06:09 |
| Nautical Twilight Begin | 06:43 |
| Civil Twilight Begin | 07:16 |
| Sunrise | 07:46 |
| Sunset | 18:29 |
| Civil Twilight End | 18:58 |
| Nautical Twilight End | 19:32 |
| Astronomical Twilight End | 20:06 |
| Moon Illumination | 38.3% |