| Geyser | 1971-05-20 |
|---|---|
| Beehive | 1340 |
| Castle | 0945 ie |
| Depression | 1040 |
| Grand | 0950 ie |
| Lion | 0913, 1030, 1112, 1440, 1620 |
| Old Faithful | 0835 short, 0921 long, 1033 short, 1124 long, 1325 long, 1447 short, 1547 long, 1706 |
| Values for Old Faithful Area | 1971-05-20 |
|---|---|
| Astronomical Twilight Begin | 03:40 |
| Nautical Twilight Begin | 04:32 |
| Civil Twilight Begin | 05:16 |
| Sunrise | 05:50 |
| Sunset | 20:48 |
| Civil Twilight End | 21:23 |
| Nautical Twilight End | 22:06 |
| Astronomical Twilight End | 22:58 |
| Moon Illumination | 23.58% |