I note with interest the comments made above on the application of ziwei and fengshu to:
1. people born outside of China, or emmigrated from China to other places
2. how fengshu theories apply to overseas places

I would just like to share my views in brief on the above. I decided to use English on the assumption that the parties here are more conversant with English than Chinese.

1. The development of Ziwei and Bazi in China follows closely the development of 天星, 七政,etc. and use the 時辰, and the sun and the moon location to chart the life of individuals. Of course, at the time, there was no precise way to measure the exact time of birth of the inidvidual and China is a big country, so there the old masters developed a way to chart life based on the average time that approximate the local time of birth in China so that in most cases, they did not need to readjust time even if the peson is born in the eatern or central or the western part of China.
2. In extreme cases where the deviations are too big, then the Book of Ziwei suggested that you use the shi chen before and after to test the time.
This is what masters now normally do when they face situation like that.
3. If you are born in the northern ham and not in China, it thus follows that you should first use the local time to plot the life chart and test it against the individual's outlook, character, father, mother, brothers , marriage, friends, etc and see if the time works. if not use the hour before or after to test and that should work.
4. the problem with the birth in foreign places is that the adoption of average local time is tested by the old masters in China and not abroad so more deviations may arise. However, in my view, the use of the shi chen beore and after should take care of that issue.
5. the use of ziwei and bazi to people born in southeren ham raise an important issue of applicability because the loaction and brightness of the sun and moon and weather in southern ham are drastically different from that of the Northern Ham so a lot of the comments from the old works become totally dislocated.
6. based on my experience in working on individuals born in northern ham outside of China, the chart based on local time normally works very well. But not in the southern ham. Of course, I don't have enough samples to draw definitive conclusionson this point.
7. For fengshu, it works for both northern ham and southern ham using the same set of rules and principles. I have worked on a lot of such projects in north america, and australia and even new zealand, they all work out using the same principles. Thd difference here is that fengshu uses 地運,and does not depends on 天星, 日月.
8. the key issue that one needs to bear in mind is the use of magnetic north. fengshu use magnetic north not true north nor grid north, so, in determining the alignment of 坐向,one needs to make adjustment on magnetic deinclination based on the location where the property is located. for places like hong kong the adjustment is de minimus, but for places like Canada, it could be 13 degrees, so will have a big effect on deciding the 坐向.


the other issues raised above involved 潤月生, 和twins. These are more difficult issues because of the particular time or type of birth. but those can be resolved even though the theory there is more difficult and I don't think it is appropriate to deal with here and in any event, those are lesser occurances in life.

The issue of emmigration is not difficult to deal with. In short, for the first three years after emigration, use the 遷移宮做命宮.

i hope you will find the above informaiton helpful.