Question

On July 1 in Newbury the sun will rise at 04:53 and set at 21:25. The local noon will be exactly halfway between these times. At what time will the local noon be in Newbury on July 1?

Answer 1

From geometry, sinθ=

R+h

h

& sinr=

R+h

R

Using snell's law, nsinr=sin(θ+r), as angle of incidence i=θ+δ

Thus sin[sin

−1

(

R+h

h

)+δ]=

R+h

nR

⟹δ=sin

−1

(

R+h

nR

)−sin

−1

(

R+h

R

)

Answer 2

Answer:

On July 1 in Newbury the sun will rise at 04:53 and set at 21:25. The local noon will be exactly halfway between these times. At what time will the local noon be in Newbury on July 1?