| Geyser | 1993-04-07 |
|---|---|
| Grand | 1940 |
| Values for Old Faithful Area | 1993-04-07 |
|---|---|
| Astronomical Twilight Begin | 05:09 |
| Nautical Twilight Begin | 05:47 |
| Civil Twilight Begin | 06:22 |
| Sunrise | 06:52 |
| Sunset | 19:58 |
| Civil Twilight End | 20:27 |
| Nautical Twilight End | 21:03 |
| Astronomical Twilight End | 21:40 |
| Moon Illumination | 99.68% |