No, north is still magnetic north, it has nothing to do with solar energy - if you're talking about Feng Shui. Last year, I did probono PR work for a series of monthly talks by Feng Shui experts. They all asserted that magnetic north is always the basis for FS, no matter what hemisphere you are in.
Solar energy has no bearing on FS, which is based upon magnetic fields in the earth, and the position of structures on the landform, in relation to the wind and water. HTH.
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