# HW6_solutions - ECE 333 Homework 6 Solutions Spring 2010 1...

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ECE 333 Homework 6 Solutions :: Spring 2010 1 Find the altitude angle and azimuth angle of the sun at the following (solar) times and places: The following equations will be used for each part of this problem: = 23.45sin [ 360 365 n 80 ] (7.6) sin = cos L cos cos H sin L sin (7.8) s = sin 1 cos sin H cos (7.9) a) March 1 st at 10:00 am in New Orleans, latitude 30 o N From Table 7.1, on March 1 st n = 60 = 23.45sin [ 360 365 60 80 ] =− 8.3 o = sin 1 [ cos 30 o cos − 8.3 o cos 30 o  sin 30 o sin − 8.3 o ]= 42.1 o s = sin 1 cos − 8.3 o sin 30 o cos 42.1 o = 41.8 o given that cos H tan tan L s 90 o Azimuth is 41.8 o (southeast) b) July 1 st at 5:00 pm in San Francisco, latitude 38 o From Table 7.1, on July 1 st n = 182 = 23.45sin [ 360 365 182 80 ] = 23.1 o = sin 1 [ cos 38 o cos 23.1 o cos 75 o  sin 38 o sin 23.1 o ]= 25.4 o s = sin 1 cos 23.1 o sin − 75 o cos 25.4 o =− 79.6 o given that cos H tan tan L s 90 o Azimuth is 180-79.6 = 100.4 o (southwest) c) December 21 st at 11:00 am at latitude 68 o Winter solstice so δ = -23.45 o = sin 1 [ cos 68 o cos − 23.45 o cos 15 o  sin 68 o sin − 23.45 o ]=− 2.12 o s = sin 1 cos − 23.45 o sin 15 o cos − 2.12 o = 13.75 o given that

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## This note was uploaded on 03/04/2011 for the course ECE 333 taught by Professor Overby during the Spring '09 term at University of Illinois, Urbana Champaign.

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HW6_solutions - ECE 333 Homework 6 Solutions Spring 2010 1...

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