Question

Consider June 21<sup>st</sup> in Seattle (latitude 47°). (a). Use the following equation to help find the time of the day (solar time) at which the sun will be due West. $cos H geq frac{ an delta}{ an L}$, then $|phi_s| leq 90^circ$; otherwise $|phi_s| > 90^circ$ (b). At that time, what will the altitude angle of the sun be? (c). As a check on the validity of the equation in (a), use your answer from (a) and (b) in the following two equations to be sure they yield an azimuth angle of -90°. $sin eta = cos L cos delta cos H + sin L sin delta$ $sin phi_s = frac{cos delta sin H}{cos eta}$

          Consider June 21<sup>st</sup> in Seattle (latitude 47°).
(a). Use the following equation to help find the time of the day (solar time) at which the sun will be
due West.
$cos H geq frac{	an delta}{	an L}$, then $|phi_s| leq 90^circ$; otherwise $|phi_s| > 90^circ$
(b). At that time, what will the altitude angle of the sun be?
(c). As a check on the validity of the equation in (a), use your answer from (a) and (b) in the
following two equations to be sure they yield an azimuth angle of -90°.
$sin eta = cos L cos delta cos H + sin L sin delta$
$sin phi_s = frac{cos delta sin H}{cos eta}$

$Consider June 21<sup>st</sup> in Seattle (latitude 47°). (a). Use the following equation to help find the time of the day (solar time) at which the sun will be due West. cos H geq frac an delta an L, then |phis| leq 90^circ; otherwise |phis| > 90^circ (b). At that time, what will the altitude angle of the sun be? (c). As a check on the validity of the equation in (a), use your answer from (a) and (b) in the following two equations to be sure they yield an azimuth angle of -90°. sin eta = cos L cos delta cos H + sin L sin delta sin phis = fraccos delta sin Hcos eta$

Added by Thomas B.

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