Purple White Flying Stars are developed from Late Heaven Hexagrams (Pa Kua) with Lo Shu (Turtle Back 2283 B.C). It's also connected with Five Elements since River Diagram (3000 B.C.) applies on it. The following table is the complete cycle of 180 years.

Upper Big Period (Start Point)			Middle Big Period (Start Point)			Lower Big Period (Start Point)
1864 to 1923			1924-1983			1984-2043
Period 1	Period 2	Period 3	Period 4	Period 5	Period 6	Period 7	Period 8	Period 9
1864-1883	1884-1903	1904-1923	1924-1943	1944-1963	1964-1983	1984-2003	2004-2023	2024-2043
1 White	2 Black	3 Green	4 Green	5 Yellow	6 White	7 Red	8 White	9 Purple
Kan	Kun	Chen	Sun	N/A	Chien	Tui	Ken	Li
Water	Earth	Wood	Wood	Earth	Metal	Metal	Earth	Fire
Eastern	Western	Eastern	Eastern		Western	Western	Western	Eastern

From 2004 to 2003, the Earth is in charge of Period 8. So the strength of 2 Black and 8 White corners of a house will be stronger in this 20 years. If a 8 White Kua person lives in a 8 White Kua house, he or she will be luckier according to the theory of Feng Shui. That means a right person lives in right house.

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