1The sun
ContentsOn Oct 11 the noon sun stands 52 degrees above the horizon at 30.78 N, and the day is 11 h 25 min long. Level ground there takes 79 per cent of the noon sunlight a surface facing the sun would.
From the Field Book
FB-ENG-007, Fig. ARadiation budgetWhere the sunlight that reaches this ground goes once it arrives.
