While the IHub MDA Thread provides a forum to cordial and respectfully present my views and works, I don't have the time or the inclination to invest the effort into this thread as I did for the original thread on SI. The IHub MDA Thread does have a few worthwhile contributors, the now defunked SI MDA Thread during its hay day would see 200 to 400 posts per day by a host of competent contributors.
The Bradley Siderograph seems to provide fairly accurate approximate turn dates although the direction seems to invert from time to time. I have no clue as to why it seems to work...gg
Here is the site to which I refer. It also provides a brief explanation as to who originated the Bradley Siderograph and of what it is constructed...