Personal Year cycles tend to enter and leave gradually, overlapping the previous cycle for a month or two. This affects your Personal Month cycles described further down in your Relationship Forecast.

As a rule of thumb, in a relationship the most compatible cycles are those that are separated by a factor of 2, such as 1 and 3, or 2 and 4, or 7 and 9. Cycles that tend to be more challenging are separated by a factor of 1, such as 2 and 3, or 3 and 4, or 8 and 9, etc. However, there are exceptions to both rules and if they apply you will find it mentioned in your forecast. 

It is also not uncommon for two people to share the same Personal Year cycle (about 1 in 10 do), and when that is the case, they will always share the same Personal Year and Personal Month cycles. This is generally considered a positive between couples but not always; just as two people respond different to the same weather or landscape, they are affected in a different way by cycles. Still, there is a shared experience and therefore potentially, a shared understanding.