| Geyser | 1979-04-12 |
|---|---|
| Echinus | 1520:18 |
| Values for Old Faithful Area | 1979-04-12 |
|---|---|
| Astronomical Twilight Begin | 04:00 |
| Nautical Twilight Begin | 04:38 |
| Civil Twilight Begin | 05:14 |
| Sunrise | 05:44 |
| Sunset | 19:03 |
| Civil Twilight End | 19:33 |
| Nautical Twilight End | 20:09 |
| Astronomical Twilight End | 20:48 |
| Moon Illumination | 99.93% |