| Geyser | 1970-05-21 |
|---|---|
| Castle | 1315 |
| Grand | 1355 |
| Old Faithful | 0846 long, 0950 short, 1056 short, 1200 long, 1316 short, 1411 short, 1524 short, 1621 short |
| Riverside | 1015 |
| West Flood | 1615 |
| Values for Old Faithful Area | 1970-05-21 |
|---|---|
| Astronomical Twilight Begin | 03:38 |
| Nautical Twilight Begin | 04:30 |
| Civil Twilight Begin | 05:15 |
| Sunrise | 05:49 |
| Sunset | 20:50 |
| Civil Twilight End | 21:24 |
| Nautical Twilight End | 22:08 |
| Astronomical Twilight End | 23:01 |
| Moon Illumination | 99.99% |