Masonry Magazine January 1980 Page.26
TABLE 3ª
Length of Horizontal Projection Required for Shading Windows and Walls
(For Shading 10 ft down from Projection for April 11 through September 1)
Sun Time Projection in Feet Sun Time
Sun Time Projection in Feet
Sun Time
Latitude
Latitude
AM
E SE S SW
PM
AM
E SE S SW
PM
6 a.m.
7
::
6 p.m.
5
6 a.m.
7
::
6 p.m.
3.6... 5
8
16.5 15.8 1.6
4
8
19.6 18.7 6.5...
4
24 Deg North
9
10.0 10.7 2.3
3
48 Deg North
9
12.0 13.7
7.5...
3
10
5.8 7.5 2.7.
2
10
7.3 10.8 8.4
2
11
2.8 3.8 2.7
1
11
3.2 8.4 8.4 3.2
1
12 N
2.2
2.8 2.2 12 N
12 N
6.0
8.4 6.0 12 N
6a.m.
:
6 p.m.
6a.m.
6 p.m.
7
1.7
5
7
4.9...
5
8
17.3 14.2 3.0
4
8
7.8
4
32 Deg North
9
10.3 10.0 3.8
3
56 Deg North
9
13.5 16.3 9.3 3
10
6.0 7.3 4.2
2
10
7.9 13.0 10.4 1.4
2
11
2.8 5.1 4.2 1.2 1
11
3.9 10.2 10.6 4.7 1
12 N
13.0 4.2
3.0
12 N
12 N
7.5 10.7 7.5 12 N
6 a.m.
6 p.m.
AM
W SW
S SE
PM
7
1.8
5
8
18.9 16.1 4.3
4
40 Deg North 9
11.2
11.6 5.4
3
10
6.5
9.1 5.8
2
11
3.1
6.5 6.1
2.2 1
12 N
4.3 6.3
4.3 12 N
Reprinted with permission from the 1972 ASHRAE Handbook of Fundamentals Volume, ASHRAE HANDBOOK & Product Directory.
"Projection greater than 20 ft required.
Printed in U.S.A.
R12M-11/80