3 years from the peak brightness of The Morning Star of Venus will bring you to the peak brightness of The evening Star of Venus. Give or take a few days (still calculating).
Since there is an 8 year cycle from one peak brightness of an Evening Star to the next in that region of the year there will be an 3+8 pattern.
From one Morning Star's peak brightness 11 years later there will be an Evening Star peak brightness. Also approx 19, 27, 35 ,43 etc. years.
There is also an inverse phenomenon. From one Evening Star's peak - 5 years later will be a Morning Star's peak. As above there is also a 5, 13, 21, 29, 37, 45 etc. year pattern.
The more years passing however the further apart the effect will be as Venus moves retrograde though the year each time it peaks in that region.
