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How I am calculating the Hijri Calendar

Right now I am following the procedure bellow.
For hijri year 1370 and after wards. Moon age should be 9 hours at sun set in Mecca.

And for years before 1370 I am following Yollop's crescent visibility formula. This extends upto Hijri 1st.

This one is looking very promising as it more closely matches to what Saudi Government declares each year.