Birthday compatibility is usually calculated by three main methods.
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Astrologically the Birthday compatibility is calculated by links between planets from your natal charts. The process is pretty complicated, so we would not suggest you to do it by hand, even if you have your charts available. Special software, used by modern astrologers calculated your Birthday compatibility in seconds. You may want to get help of professional to help you understand your relationship report.
If you'd like to get free astrological Birthday compatibility report, you can. Birthday compatibility reports are available on some online websites, but they are really so readable. There are many things you might to get confused and sometimes upset about. So the sound advice is to not look at your Birthday compatibility report on your own.
You can't "calculate" the Birthday compatibility in traditional Psychology, but a lot of studies were done (of course) by psychologists to understand human interactions. No surprise - the main subject of Psychological research is us, human beings.
There are psychological tests that help a psychologist to check personality types and then make consumption either two psychological types are compatible or not. Since we've got four major personality types, this is how usually the match is made. We are going to use the most advertised personality type system by Helen Fisher (match.com).
Builders (SJ by Kersey) feel more comfortable when marry SJs.
Explorers (SP by Kersey) make a good match with other Explorers.
Directors (in Kersey - NT) are the best with Negotiators (NF by Kersey), and
Negotiators match well with Directors.
To match with someone, you obviously both should take a psychological test. If you are well-acknowledged with personality types, you probably can figure out the type of your partner on your own.
The statistics on personality types is also known. Builders and Explorers as Kersey noticed in his book are taken "over the universe", leaving only ten percent to directors and negotiators. This numbers may differ, of course, because taking psychological tests is not a Census study, but anyway - we've got a picture.
Totally there are 16 personality types in most theories, differ from researcher to researcher. Helen Fisher is mixing types. Most embraced psychological systems (with no micro-biology input) have 4 or more characteristics of human to choose from.
The end data is valid, proven and very accurate. When you are trying to figure out your compatibility level, you absolutely should look into personality types. They do not tell you everything about you. They are developing, gaining more and more data to describe our characters, personalities, thoughts and behavior. So, when you make any type of astrological, planetary, numerological compatibility check up, don't ever discharge high importance of psychology.
By Kersey, people in a constant "search of themselves" belong to NF (negotiator) type. I guess, congratulations! If you are looking at astrology, numerology and any ancient science, you are the rarest type of personality is there. Is it true? Are we all NF?
By practice, it is not. You can find any for four main types of personalities, looking for the things that aren't in a scope of Psychology. Probably, there is more to a science that will be discovered sooner or later.