| Geyser | 1971-10-20 |
|---|---|
| Beehive | 1500 |
| Castle | 0955, 1315 |
| Depression | 1144 |
| Grand | 1500 ie |
| Lion | 0839, 1013 |
| North Goggle | 1146 |
| Old Faithful | 0830 long, 0940 long, 1046 long, 1400 short, 1516 long, 1619 short |
| Values for Old Faithful Area | 1971-10-20 |
|---|---|
| Astronomical Twilight Begin | 06:07 |
| Nautical Twilight Begin | 06:41 |
| Civil Twilight Begin | 07:14 |
| Sunrise | 07:44 |
| Sunset | 18:31 |
| Civil Twilight End | 19:01 |
| Nautical Twilight End | 19:35 |
| Astronomical Twilight End | 20:08 |
| Moon Illumination | 0.76% |