| Geyser | 1973-04-15 |
|---|---|
| Ledge | 1050 A |
| Valentine | 2132 |
| Values for Old Faithful Area | 1973-04-15 |
|---|---|
| Astronomical Twilight Begin | 03:52 |
| Nautical Twilight Begin | 04:31 |
| Civil Twilight Begin | 05:08 |
| Sunrise | 05:38 |
| Sunset | 19:07 |
| Civil Twilight End | 19:38 |
| Nautical Twilight End | 20:14 |
| Astronomical Twilight End | 20:54 |
| Moon Illumination | 94.7% |