Its not likely to be exactly 180 degrees.
In fact, whatever amount it does finally settle down on will only be after a long period of variations and oscillations, and it will vary depending on where on earth you are. Also, the time scale over which this happens may be thousands of years, or will be interrupted by long periods of change and alternate behavior. And will it all begin (and end) suddenly, or gradually?
We may just have to learn the stars, and pray for clear weather.