| Geyser | 1983-05-17 |
|---|---|
| Echinus | 2053 |
| Steamboat | 2013 |
| Values for Old Faithful Area | 1983-05-17 |
|---|---|
| Astronomical Twilight Begin | 03:45 |
| Nautical Twilight Begin | 04:36 |
| Civil Twilight Begin | 05:19 |
| Sunrise | 05:53 |
| Sunset | 20:45 |
| Civil Twilight End | 21:19 |
| Nautical Twilight End | 22:02 |
| Astronomical Twilight End | 22:53 |
| Moon Illumination | 24.3% |