| Geyser | 1979-09-20 |
|---|---|
| Africa | 1800 |
| Arsenic | 1825 ie |
| Dark Cavern | 1810 |
| Dog's Leg Spring | 0900 |
| Fan-Norris | 1800 |
| Fireball | 1800 |
| Hurricane Vent | 1800 |
| Little Whirligig | 1802, 1908 |
| Pinto | 1800 |
| Whirligig | 1828 |
| Values for Old Faithful Area | 1979-09-20 |
|---|---|
| Astronomical Twilight Begin | 05:29 |
| Nautical Twilight Begin | 06:04 |
| Civil Twilight Begin | 06:38 |
| Sunrise | 07:07 |
| Sunset | 19:25 |
| Civil Twilight End | 19:54 |
| Nautical Twilight End | 20:29 |
| Astronomical Twilight End | 21:04 |
| Moon Illumination | 1.21% |