Fig.3. Degree changes and uneven distribution of directions according to the principle of 2 cycles & 8 periods (By fixing method & updated from Fig.2).

Designed by Mr. Chan Kam

Drawn by Mr. Wai Wah

Fig.3. Degree changes and uneven distribution of directions according to the principle of 2 cycles & 8 periods (By fixing method & updated from Fig.2). Two kind of calculation are shown.