| Geyser | 1971-05-31 |
|---|---|
| Beehive | 1840 |
| Old Faithful | 0831 short, 0920 long, 1043 short, 1152 short, 1236 long, 1356 short, 1447 long, 1617 short, 1725 long |
| Round | 1250 |
| Values for Old Faithful Area | 1971-05-31 |
|---|---|
| Astronomical Twilight Begin | 03:23 |
| Nautical Twilight Begin | 04:20 |
| Civil Twilight Begin | 05:06 |
| Sunrise | 05:42 |
| Sunset | 20:59 |
| Civil Twilight End | 21:35 |
| Nautical Twilight End | 22:21 |
| Astronomical Twilight End | 23:18 |
| Moon Illumination | 42.57% |