We’ll need three lengths: the radius of the sun R\ns⊙=6.96×108\Rm, the radius of the earth R\nsℜ=6.38×106\Rm, and the radius of the earth’s orbit \(a\ns_\Re=1.50\time...We’ll need three lengths: the radius of the sun R\ns⊙=6.96×108\Rm, the radius of the earth R\nsℜ=6.38×106\Rm, and the radius of the earth’s orbit a\nsℜ=1.50×1011\Rm. This is known as the ultraviolet catastrophe, since the divergence comes from the large ν part of the integral, which in the optical spectrum is the ultraviolet portion.
