INDEX:HSI   HANG SENG INDEX
By Gann 10 year-cycle theory, this year 2017 is 10 years after the 2007.
This analysis used Gann Box, Price division by Fib ratio (vertical axis) and Time division (horizontal axis) by Gann wheel.
I put 120 months( From October 2007 to October 2017) into the 360 degree Gann wheel, the time division indicates critical ratio of Gann Wheel: 0.25 (90), 0.333(120), 0.5(180), 0.666(240), 0.75(270) and 1(360).

Moreover, by enabling angle lines of the Gann Box, then I tried to match as much as Gann lines to HSI curve. Finally I got the Gann Box size as shown.

The 10 year-cycle top might appear in the October this year about 28780
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