| Geyser | 1971-01-28 |
|---|---|
| Castle | 1600 |
| Grand | 0830, 1642 |
| Great Fountain | 1140 |
| Lion | 0830, 1410, 1557 |
| Old Faithful | 1432 short, 1521 long, 1637 short |
| Values for Old Faithful Area | 1971-01-28 |
|---|---|
| Astronomical Twilight Begin | 06:05 |
| Nautical Twilight Begin | 06:40 |
| Civil Twilight Begin | 07:15 |
| Sunrise | 07:46 |
| Sunset | 17:26 |
| Civil Twilight End | 17:57 |
| Nautical Twilight End | 18:32 |
| Astronomical Twilight End | 19:06 |
| Moon Illumination | 2.58% |