| Geyser | 1971-10-12 |
|---|---|
| Beehive | 1636 |
| Castle | 1520 |
| Grand | 1331 |
| Old Faithful | 1037 long, 1153 short, 1242 long, 1352 short, 1443 long, 1555 short, 1640 long |
| Values for Old Faithful Area | 1971-10-12 |
|---|---|
| Astronomical Twilight Begin | 05:57 |
| Nautical Twilight Begin | 06:31 |
| Civil Twilight Begin | 07:05 |
| Sunrise | 07:34 |
| Sunset | 18:45 |
| Civil Twilight End | 19:14 |
| Nautical Twilight End | 19:48 |
| Astronomical Twilight End | 20:22 |
| Moon Illumination | 39.79% |