Here are the details of my method. First I will show what I call Horizontal Sun Numbers.
GROUPS
1) 1 3 6 32 34 35
2) 7 8 11 27 28 30
3) 14 15 16 19 23 24
4) 13 17 18 20 21 22
5) 9 10 12 25 26 29
6) 2 4 5 31 33 36
These are the Vertical Sun Numbers
1) ...
GROUPS
1) 1 3 6 32 34 35
2) 7 8 11 27 28 30
3) 14 15 16 19 23 24
4) 13 17 18 20 21 22
5) 9 10 12 25 26 29
6) 2 4 5 31 33 36
These are the Vertical Sun Numbers
1) ...