| Geyser | 1971-10-19 |
|---|---|
| Beehive | 0341 |
| Castle | 0845 ie, 1645 |
| Grand | 1025 |
| Old Faithful | 0851 short, 1333 long, 1454 short, 1541 long, 1650 long |
| Riverside | 1103 |
| Values for Old Faithful Area | 1971-10-19 |
|---|---|
| Astronomical Twilight Begin | 06:06 |
| Nautical Twilight Begin | 06:39 |
| Civil Twilight Begin | 07:13 |
| Sunrise | 07:43 |
| Sunset | 18:33 |
| Civil Twilight End | 19:02 |
| Nautical Twilight End | 19:36 |
| Astronomical Twilight End | 20:10 |
| Moon Illumination | 0.01% |