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  • Earth and Sun To Scale

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  • SurveyPlot-1

    Activity

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  • Horizon Calculator

    Activity

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  • Copy of Sphere and tangent plane

    Activity

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  • Why 8"×d² is only an approximation for short distances

    Activity

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  • Height Obscured by Horizon

    Activity

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  • Solar Parallax Computer

    Activity

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  • Shadow Length at Equinox by Latitude & Stick Height

    Activity

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  • Copy of Sun Angles in Reality

    Activity

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