| Geyser | 1974-09-01 |
|---|---|
| Bear Den | 1652 |
| Congress Pool | 1800 |
| Constant | 1553, 1649 |
| Echinus | 0936, 1047, 1152, 1257, 1405, 1511, 1616, 1724 |
| Values for Old Faithful Area | 1974-09-01 |
|---|---|
| Astronomical Twilight Begin | 05:01 |
| Nautical Twilight Begin | 05:39 |
| Civil Twilight Begin | 06:15 |
| Sunrise | 06:45 |
| Sunset | 20:00 |
| Civil Twilight End | 20:30 |
| Nautical Twilight End | 21:06 |
| Astronomical Twilight End | 21:44 |
| Moon Illumination | 99.71% |