| Geyser | 1971-05-21 |
|---|---|
| Beehive | 1250 |
| Castle | 1145 |
| Old Faithful | 0811 short, 0853, 1015 short, 1105 long, 1225, 1329 long, 1439 long, 1558 short, 1644 long |
| Values for Old Faithful Area | 1971-05-21 |
|---|---|
| Astronomical Twilight Begin | 03:38 |
| Nautical Twilight Begin | 04:31 |
| Civil Twilight Begin | 05:15 |
| Sunrise | 05:49 |
| Sunset | 20:49 |
| Civil Twilight End | 21:24 |
| Nautical Twilight End | 22:08 |
| Astronomical Twilight End | 23:00 |
| Moon Illumination | 14.36% |