| Geyser | 1979-07-28 |
|---|---|
| Arsenic | 0830 |
| Fireball | 1800 |
| Values for Old Faithful Area | 1979-07-28 |
|---|---|
| Astronomical Twilight Begin | 03:58 |
| Nautical Twilight Begin | 04:48 |
| Civil Twilight Begin | 05:31 |
| Sunrise | 06:05 |
| Sunset | 20:54 |
| Civil Twilight End | 21:27 |
| Nautical Twilight End | 22:10 |
| Astronomical Twilight End | 23:00 |
| Moon Illumination | 15.06% |