正午太阳高度计算的公式为：H＝90°－φ＋δ（H为正午太阳高度,φ为当地纬度,δ为直射点的纬度）.在公式中φ永远取正值,δ在当地的夏半年取正值,冬半年取负值.在南北回归线之间,当H＞90°时,当地正午的太阳高度需用180°－H
=90-40+10=60度
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