| Geyser | 1973-04-14 |
|---|---|
| Ledge | 1857 |
| Valentine | 2125 A |
| Values for Old Faithful Area | 1973-04-14 |
|---|---|
| Astronomical Twilight Begin | 03:54 |
| Nautical Twilight Begin | 04:33 |
| Civil Twilight Begin | 05:10 |
| Sunrise | 05:40 |
| Sunset | 19:06 |
| Civil Twilight End | 19:36 |
| Nautical Twilight End | 20:13 |
| Astronomical Twilight End | 20:52 |
| Moon Illumination | 89.07% |