| Values for Old Faithful Area | 1973-09-30 |
|---|---|
| Astronomical Twilight Begin | 05:43 |
| Nautical Twilight Begin | 06:17 |
| Civil Twilight Begin | 06:51 |
| Sunrise | 07:20 |
| Sunset | 19:06 |
| Civil Twilight End | 19:35 |
| Nautical Twilight End | 20:08 |
| Astronomical Twilight End | 20:43 |
| Moon Illumination | 14.02% |