| Geyser | 1971-02-21 |
|---|---|
| Old Faithful | 1340 short, 1424 long, 1537 short |
| Values for Old Faithful Area | 1971-02-21 |
|---|---|
| Astronomical Twilight Begin | 05:37 |
| Nautical Twilight Begin | 06:11 |
| Civil Twilight Begin | 06:44 |
| Sunrise | 07:14 |
| Sunset | 17:59 |
| Civil Twilight End | 18:29 |
| Nautical Twilight End | 19:02 |
| Astronomical Twilight End | 19:36 |
| Moon Illumination | 22.17% |