| Geyser | 1988-01-20 |
|---|---|
| Cascade | 1127, 1141, 1158, 1223, 1235, 1259, 1313, 1349, 1404, 1423, 1438, 1500, 1526, 1543, 1604, 1626, 1649, 1702, 1733 |
| Values for Old Faithful Area | 1988-01-20 |
|---|---|
| Astronomical Twilight Begin | 06:11 |
| Nautical Twilight Begin | 06:45 |
| Civil Twilight Begin | 07:21 |
| Sunrise | 07:53 |
| Sunset | 17:15 |
| Civil Twilight End | 17:47 |
| Nautical Twilight End | 18:22 |
| Astronomical Twilight End | 18:57 |
| Moon Illumination | 1.69% |