1The sun
ContentsOn Oct 16 the noon sun stands 40 degrees above the horizon at 40.95 N, and the day is 10 h 56 min long. Level ground there takes 64 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.
