Tilt Model

Summer solstice, the sun reaches (90-latitude)+23.5 degrees above the horizon. (75.5 degrees for us)

Winter solstice, the sun only reaches latitude -23.5 degrees above the horizon (28.5 degrees for us)

Difference in illumination per square meter of ground:

sin(28.5)/sin(75.5)=0.5

50% less sun per square meter at noon.

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