You might want to read what you link: Because the insolation function is the same for the northern and southern hemispheres, i.e., S˜(φ,ε)=S˜(−φ,−ε), annual sol

You might want to read what you link: Because the insolation function is the same for the northern and southern hemispheres, i.e., S˜(φ,ε)=S˜(−φ,−ε), annual solar insolation is the same for corresponding latitudes in each hemisphere.