This graphic shows the Earth's postition on its orbit around the sun on December 1st with colors that indicate the northern hemisphere's seasons. Popularly seen we enter the three-monthly winter season, astronomically seen this will happen in three weeks only when we'll have the longest night / shortest day and the incoming solar radiation will be at its minimum. Interesting that after this day the temperature will still decrease for a while in spite of the increasing solar radiation. This must have something to do with the thermal capacity of the sea and the land: it is cooling off as long as the emitted energy is greater than the absorbed energy. And when does winter begin phenologically seen? This is the question I want to investigate with you in an additional project I'm developing and plan to start up sometime next year.
