| Geyser | 1981-05-03 |
|---|---|
| Harding | 0930 |
| Values for Old Faithful Area | 1981-05-03 |
|---|---|
| Astronomical Twilight Begin | 04:13 |
| Nautical Twilight Begin | 04:58 |
| Civil Twilight Begin | 05:38 |
| Sunrise | 06:10 |
| Sunset | 20:29 |
| Civil Twilight End | 21:02 |
| Nautical Twilight End | 21:42 |
| Astronomical Twilight End | 22:27 |
| Moon Illumination | 1.36% |