| Geyser | 1973-10-15 |
|---|---|
| Ledge | 1530 |
| Values for Old Faithful Area | 1973-10-15 |
|---|---|
| Astronomical Twilight Begin | 06:02 |
| Nautical Twilight Begin | 06:35 |
| Civil Twilight Begin | 07:09 |
| Sunrise | 07:38 |
| Sunset | 18:39 |
| Civil Twilight End | 19:08 |
| Nautical Twilight End | 19:42 |
| Astronomical Twilight End | 20:16 |
| Moon Illumination | 87.73% |