Use (7.11) to help find the time of day (solar time) at which the sun will be du

ID: 1813683 • Letter: U

Question

Use (7.11) to help find the time of day (solar time) at which the sun will be due West.

equation 7.11 is:

If cos H is equal or greater than tan delta / tan L than the azimuth angle is equal or less than 90 degrees

otherwise the azimuth angle is greater than 90 degrees

L = Latitude = 47 degrees

Azimuth Angle = due west = -90 degrees

delta = 23.45 (as its the solstice)

H = hour angle = 15 degrees/hour * hours before solar noon. aka at 11am (solar time), H = +15 degrees. 2pm would be -30 degrees

Other (possibly) helpful equations:

Beta sub N = 90 degrees - L + delta (at solar noon)

sin(beta) = cos(L) * cos(delta) * cos(H) + sin(L) * sin(delta)

Please show how you arrived at your answer!

beta=90-47+23.45=66.45 degrees

L=47

delta=23.45

so sin(beta) = cos(L) * cos(delta) * cos(H) + sin(L) * sin(delta)

putting the values ,we get H=0

so it will be at exact noon .

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