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Solar Angles Describe the sun position relative to a vertical surface

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Solar Altitude: β (beta) Vertical angle to sun position

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Solar Azimuth: Φ (phi) Horizontal bearing angle from south

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Surface Azimuth: Ψ (psi) Surface horizontal bearing angle from south

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Surface Solar Azimuth: γ (gamma) Angle between solar and surface azimuths γ = Φ - Ψ

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Sign Conventions Angles east of south are negative Angles west of south are positive + - S -90º90º 0º -45º 45º

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Calculating Surface Solar Azimuth γ = Φ – Ψ For example: Building façade is oriented south east (Ψ =-45º) Solar azimuth (ϕ) is 30º west of south γ = 30º – (-45º) = 75º Note: |γ|≥ 90º, façade in shade -45º 30º

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