| Geyser | 1971-10-01 |
|---|---|
| Castle | 0815 ie |
| Depression | 1050 |
| Grand | 1310 |
| Old Faithful | 0910 long, 1026 short, 1114 long, 1334 short, 1425 long, 1540 short, 1644 long |
| Riverside | 1345 |
| Values for Old Faithful Area | 1971-10-01 |
|---|---|
| Astronomical Twilight Begin | 05:43 |
| Nautical Twilight Begin | 06:18 |
| Civil Twilight Begin | 06:51 |
| Sunrise | 07:20 |
| Sunset | 19:05 |
| Civil Twilight End | 19:34 |
| Nautical Twilight End | 20:08 |
| Astronomical Twilight End | 20:42 |
| Moon Illumination | 85.02% |