Problem#$5$

For the data of Problem #$5,$ re$-$calculate the standard times for sunrise and sunset after

adjusting for the radius of the sun and the refraction of light through the atmosphere. For this

purpose, instead of using Eq$.1\mathrm{.}6\mathrm{.}10$ to calculate the sunset hour angle, use the equation

below, which incorporates the above phenomena:

${}_s=co{s}^{-1}(\frac{sin(-0\mathrm{.}833)-sinsin}{coscos})$