| Geyser | 1931-09-18 |
|---|---|
| Ebony | 0944 |
| Valentine | 1620 |
| Values for Old Faithful Area | 1931-09-18 |
|---|---|
| Astronomical Twilight Begin | 04:26 |
| Nautical Twilight Begin | 05:01 |
| Civil Twilight Begin | 05:35 |
| Sunrise | 06:04 |
| Sunset | 18:30 |
| Civil Twilight End | 18:59 |
| Nautical Twilight End | 19:33 |
| Astronomical Twilight End | 20:09 |
| Moon Illumination | 43.93% |