# 6 where r b r b on the representative day r d r d

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? + ? 𝑑 ? 𝑔 ? ? + ? ? - - - 6 where , r ̅ b = r b on the representative day r ̅ d = r d = ( 1+cosβ ) / 2 r ̅ r = r r = ρ ( 1- cos β ) / 2 The daily radiation falling on the surface is of interest in many applications. The ratio of daily radiation falling on such surface ( H T ) to the daily global radiation on a horizontal surface ( H g ), given by Liu and Jordan is ? 𝑇 ? 𝑔 = [1 − ? 𝑑 ? 𝑔 ] ? ? + ? 𝑑 ? 𝑔 ? ? + ? ? - - - 7 For a south facing surface, γ = 0 ? ? = 𝜔 ?? ?𝑖? 𝛿 ?𝑖?(𝜑−𝛽)+??? 𝛿?𝑖? 𝜔 ?? ???(𝜑−𝛽) 𝜔 ? ?𝑖? 𝜑 ?𝑖?𝛿+??? 𝜑 ??? 𝛿 ?𝑖?𝜔 ? - - - 8 R d = r d = (1+ cos β ) / 2 - - - 9 R r = r r = ρ (1- cos β ) / 2 - - - 10 In Equation 8, ω st and ω s are the sunrise and sunset angles expressed in radians for the tilted surface and a horizontal surface respectively.
8 characteristics are used to protect the disc surface from the weather. An accuracy of about ±2 percent can be obtained with the Instrument. 3.6.2 Shading ring Pyranometer The Pyranometer can also be used for measuring diffused radiation.

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