| Geyser | 1971-01-17 |
|---|---|
| Grand | 1655 |
| Lion | 1505 |
| Old Faithful | 1224 short, 1313 long, 1427 short |
| Silex Spring | 1130, 1330 |
| Values for Old Faithful Area | 1971-01-17 |
|---|---|
| Astronomical Twilight Begin | 06:12 |
| Nautical Twilight Begin | 06:47 |
| Civil Twilight Begin | 07:23 |
| Sunrise | 07:55 |
| Sunset | 17:11 |
| Civil Twilight End | 17:43 |
| Nautical Twilight End | 18:19 |
| Astronomical Twilight End | 18:54 |
| Moon Illumination | 72.51% |